Special Collections Department
403 Parks Library
Iowa State University
Ames, IA 50011-2140

RS 11/4/52
Burrell Franklin Ruth (1901-1954)
Papers, 1925-1957, undated


Descriptive summary

creator: Ruth, Burrell Franklin (1901-1954)
title: Papers
dates: 1925-1957, undated
extent: 10.5 linear feet (25 document boxes)
collection number: RS 11/4/52
repository: University Archives, Special Collections Department, Iowa State University.

 

Administrative information

access: Open for research
publication rights: Consult Head, Special Collections Department
preferred citation: Burrell Franklin Ruth Papers, RS 11/4/52, Special Collections Department, Iowa State University Library.

 

Abstract

Burrell Franklin Ruth was a chemical engineering professor in the Department of Chemical Engineering at Iowa State University. His collection includes his research, notes, calculations, publications, speeches, and writings. His research included work on the fundamentals of filtration, flow of fluids through porous media, humidification, mechanism of drying, and correlation of heat and mass transfer with fluid friction. In addition to these materials, the collection also contains news clippings, biographical information, and information regarding the Shakespeare and Francis Bacon controversy.

 

Biographical note

Burrell Franklin Ruth was born in Traverse City, Michigan, on July 21, 1901. He received his B.S. (1923) and M.S. (1925) degrees in chemical engineering from Michigan State College (University). He went on to receive his Ph.D. (1931) from the University of Minnesota. Before arriving at Iowa State, Ruth served as an instructor (1926-1937) in chemical engineering at the University of Minnesota and Professor (1937-1938) of chemical engineering at Texas A&M University (1937-1938). He took a position with Iowa State as Associate Professor (1938-1942) of chemical engineering and was promoted to Professor (1942-1954).

In addition to his work as a professor, Ruth was associated with the Ames Laboratory of the Atomic Energy Commission as a Senior Chemical Engineer. He was also a member of the American Institute of Chemical Engineers, the American Society of Mechanical Engineers, the American Society for Engineering Education, the American Chemical Society, the American Society for the Advancement of Science, Phi Lambda Upsilon, Sigma Xi, and Delta Sigma Phi.

Ruth was known for his unconventional, hands-on teaching practices. He integrated much of his own research and learning into his courses, and students' testimonies reveal that though his courses were difficult, they were extremely valuable. His research included work on the fundamentals of filtration, flow of fluids through porous media, humidification, mechanism of drying, and correlation of heat and mass transfer with fluid friction. In addition to this he was a rare book collector and connoisseur; he was particularly invested in the Francis Bacon and Shakespeare controversy, which theorized that Bacon was the true author of the Shakespearian plays.

He died of a heart attack on January 1, 1954.

 

Collection description

This collection (1925-1957, undated) primarily consists of notes and research done by Burrell Franklin Ruth. As a professor, his research endeavors included work on the fundamentals of filtration, flow of fluids through porous media, humidification, mechanism of drying, and correlation of heat and mass transfer with fluid friction. In addition to this research, his notes and calculations are included, as well as several publications, writings, and speeches. Correspondence is also included, as well as news clippings and some biographical information from the department after his death.

The collection also contains information regarding the Shakespeare and Francis Bacon controversy, which was a cultural and personal interest of Ruth.

 

Organization

The collection is in original order.

 

Container list

Box

Folder

Title

Dates

1

1

Notes: Old Chem. E. 162 notes, filtration lectures incorporated into notes, notes on filter cake washing

1934, undated

1

2

Publications: "Fluidization" - Chem. E. Article

1953

1

3

Notes: Grashof- Prandtl Equation

undated

1

4

Research: Thermometer Emissivity Data

1942

1

5

Research: Effect of natural convection on forced convection, coefficients Kata thermometer

1944, undated

1

6

Research: Thermometer Emissivity Data

1942

1

7

Research: Natural Convection data and notes

1944, undated

1

8

Research: Mather's Data for Chem. E. 662

1950

1

9

Notes: Old Chem. E. 652 notes and reprints

1941-1948, undated

1

10

Notes: Drying experiment

1943-1946, undated

1

11

Notes: Old Chem. E. 652 notes

1942, undated

1

12

Research: Oliver Press Mss; an extension of the testing methods and equations of Batch Filtration Practice to the Field of Continuous Filtration, I. Theory of the Continuous Filter, II. An Experimental Confirmation of the Continuous Filtration Equation

1941-1950, undated

1

13

Notes: Chem. E. 351 notes on extraction

1942-1944, undated

1

14

Notes: Filtration problems, final exams, undergraduate course notes

undated

1

15

Notes: Fluid Flow - notes on paper by B.I. Miller

1936, undated

2

1

Research: Fluid flow, review of paper on flow and mass transfer

1948, undated

2

2

Drafts: Paper on velocity distribution

undated

2

3

Research: Mechanism of drying, notes and data

undated

2

4

Notes: Miscellaneous filtration notes

1930-1937, undated

2

5

Research: Fluid flow

undated

2

6

Notes: Electrokinetics

1945

2

7

Notes: Thermometers calibrations

1941-1947, undated

2

8

Drafts: Manuscript of filtration paper

1946, undated

2

9

Research: Rotary drier, notes and data

1939

2

10

Papers: "Gage Pressures vs. Absolute Pressures in the Application of Bernoulli's Theorem to Buoyant Systems", notes

undated

2

11

Papers: "Sage and Page" (Burrell Ruth as reviewer)

1946-1951, undated

2

12

Notes: Spray columns, sedimentation

1951, undated

2

13

Notes: Stoichiometry - notes, quizzes and answers

1941-1943, undated

2

14

Notes: Miscellaneous notes

1947-1953, undated

3

1

Correspondence: Collicott on filtration

1935-1947, undated

3

2

Correspondence: Dobratz on filtration and permeability

1943

3

3

Notes: Chem. E. 353, diffusional operations, absorption

1942, undated

3

4

Research: Extraction experiment

1945, undated

3

5

Notes: Laboratory extraction

undated

3

6

Notes: Laboratory extraction

undated

3

7

Notes: Chem. E. 352, Crystallization

undated

3

8

Research: Webber's crystallization experiment

1938, undated

3

9

Notes: Chem. E. 617, heat transfer equation derivation

undated

3

10

Notes: Enthalpy chart and streamline friction

undated

3

11

Research: Chem. E. Lab, absorption of alcohol, notes and data

1939-1942, undated

3

12

Research: Solvent extractions, notes and data

undated

3

13

Research: New distillation theory, notes and data

1939, undated

3

14

Research: Distillation investigation - problem material to demonstrate plate efficiency

1947

3

15

Research: Distillation

undated

3

16

Research: Distillation - mimeo by Colburn

1948, undated

3

17

Notes: Extraction paper

1946, undated

3

18

Notes: Chem. E. 652, crushing and grinding

undated

3

19

Research: Heat transfer, notes and data

1945, undated

3

20

Research: Rotary drier, notes on the ISC lab drier test

1942-1943

4

1

Notes: Fluid Mechanics

undated

4

2

Notes: Various research notes

undated

4

3

Research: Boelter data

undated

4

4

Research: Humidity graphs

undated

4

5

Notes: Rodekohr

undated

4

6

Notes: Chem. E. 617 - water cooling, notes and data

1942, undated

4

7

Notes: Chem. E. 651 - lecture notes

1942, undated

4

8

Notes: Rodekohr's thesis

undated

4

9

Research: Heat transfer - data collected by J.D. Smith

1934, undated

4

10

Research: Fluid flow - notes and data

1946, undated

4

11

Notes: Heat transfer - Clyde Berg's thesis, Chem. E. 651

1939-1943, undated

4

12

Notes: Heat transfer - Clyde Berg's thesis, Chem. E. 651

1934-1944, undated

4

13

Notes: Heat transfer

undated

4

14

Notes: Chem. E. 352 - mimeo, notes

undated

4

15

Notes: Chem. E. 353 - Heat transfer

1939-1943, undated

4

16

Notes: Heat transfer

1932-1943, undated

5

1

Research: Dimensional analysis

undated

5

2

Notes: Fluid mechanics - lab quizzes, notes

1939, undated

5

3

Notes: Fluid flow

1941-1945, undated

5

4

Research: Fluid flow mss. (fluid friction, surface roughness and Poiseuille's Law)

1938, undated

5

5

Notes: Fluid flow

undated

5

6

Notes: Fluid flow

1933, undated

5

7

Notes: Unclassified fluid flow

1932, undated

5

8

Notes: Fluid flow

1939, undated

5

9

Research: 363 Drying, McCube and McCready, data and treatment

1948-1949, undated

5

10

Notes: Old crushing and grinding

undated

5

11

Notes: Heat transfer problems

1938-1939, undated

5

12

Notes: Chem. E. 351, 352, 353 - heat transfer

1939, undated

5

13

Notes: Heat transfer

1939, undated

5

14

Notes: Heat transfer

1939, undated

6

1

Notes: Fluid flow quizzes

1938-1943, undated

6

2

Notes: Fluid flow

1939

6

3

Notes: Chem. E. 351 - size separation, conveying, mixing

1933, undated

6

4

Research: Unit operations - mimeographs (lab experiments and problems)

undated

6

5

Notes: Chem. E. 351

1939-1940, undated

6

6

Notes: Fluid flow problems

1935-1939, undated

6

7

Notes: Chem. E. 353 - Drying

1940, undated

6

8

Ph.D. preliminary exam

1938, undated

6

9

Research: Dimensional analysis - Poiseuille's Law. Stokes' Law, Rittinger's Law (falling bodies)

undated

6

10

Notes: Miscellaneous notes

1939-1942, undated

6

11

Notes: Miscellaneous notes

1943-1946, undated

6

12

Research: Lab results - absorption NH3

1941, undated

6

13

Notes: 464 Lectures

1940-1941, undated

6

14

Research: Drying - David's data with resistance readings

undated

7

1

Research: Drying theory

1940, undated

7

2

Research: Drying theory - David's paper

undated

7

3

Research: Drying theory - David's data

1942-1947, undated

7

4

Research: Drying laboratory experiments, cabinet and rotary

1942-1947, undated

7

5

Research: Drying laboratory experiments, charcoal

1940-1944, undated

7

6

Research: Drier calculations

1939

7

7

Research: Rodekohr's drying data

1939, undated

7

8

Research: Permeability (particle size and permeability) - Larian, Nelson, McNevin and Mayette

1934-1935, undated

7

9

Research: Drying - M.W.F. Squad III

1940

7

10

Research: Drying - Chem. E. 353

1939, undated

7

11

Research: Drying - Spring 1941

1940, undated

7

12

Research: Drying - Chem. E. 622 - A.D. Quackenbush

1939

8

1

Research: Drying - Chem. E. 423

1941

8

2

Research: Drying - Chem. E. 352

1942, undated

8

3

Research: Drying - Squad III

undated

8

4

Research: Drying - Drier Tests

1940, undated

8

5

Research: Drying - Squad A.- Nol.

1943-1944

8

6

Research: Drying

1940, undated

8

7

Research: Drying

1939, undated

8

8

Research: Air conditioning

undated

8

9

Research: Compression cell (permeability) test on CaCO3

1933-1945, undated

8

10

Notes: Brown's Theory

undated

8

11

Research: Air conditioning experiment data

1940, undated

8

12

Research: Furnace test, cell tests, Levin and Allen-Moore

1945, undated

8

13

Research: Drying - MWF, Squad II

1940, undated

8

14

Research: Drying - Squad IV

undated

8

15

Research: Rotary drier

undated

8

16

Research: Rotary drier

1943-1944, undated

8

17

Research: Rotary drier

1942

8

18

Research: Rotary drier

1939-1943, undated

9

1

Correspondence: Howe, Editor Ind. Eng. Chem.

1939-1941, undated

9

2

Notes: Heat transfer thesis (nozzle pressure and heat transfer coefficient)

undated

9

3

Research: Air conditioning

1940-1942, undated

9

4

Research: Air conditioning

1944, undated

9

5

Research: Humidification

1941-1943, undated

9

6

Research: Air conditioning

1939, undated

9

7

Research: Humidification

1939, undated

9

8

Notes: Chem. E. 352, Items 1-20

1936-1953, undated

9

9

Notes: Chem. E. 352, Items 21-45

1929-1949, undated

10

1

Notes: Mixing

1934-1943, undated

10

2

Research: Instrumentation

1948

10

3

Research: Emissivity data

1942, undated

10

4

Publications: Filtration - thesis work of L. L. Kempe

1934

10

5

Notes: "Theory of the Psychometer" by J. H. Arnold (reprint)

1941, undated

10

6

Research: Mass transfer in flow - Arnold's data

1942-1946, undated

10

7

Research: Emissivity data

1941, undated

10

8

Research: Radiation error

undated

10

9

Notes: Filtration - flow through porous materials

1933-1934, undated

10

10

Research: Emissivity of mercury in glass thermometer

1947

10

11

Research: Emissivity - Dropkin data

1947, undated

10

12

Research: Thermometer correction data

undated

11

1

Notes: Chem. E. 412

1939, undated

11

2

Notes: Chem. E. 411-412

1929-1941, undated

11

3

Correspondence: Personal correspondence

1946-1948, undated

11

4

Correspondence: Personal correspondence

1934-1949

11

5

Notes: Filtration

undated

11

6

Notes: Distillation

1939-1949, undated

11

7

Notes: Drying

1940-1948, undated

11

8

Notes: Chem. E. 564 - lecture notes

1947-1951, undated

12

1

Correspondence: Personal correspondence

1936-1938

12

2

Notes: Lectures

1942-1950, undated

12

3

Notes: Lectures

1947-1952, undated

12

4

Notes: Lectures

undated

12

5

Notes: Lectures

1944-1953, undated

12

6

Research: Fluid flow - notes and Nikuradse's data

1948, undated

12

7

Research: Heat transfer, fluid flow, and filtration - Walas' data

1950, undated

12

8

Research: Calculations on Nikuradse's data

undated

12

9

Research: Rough pipe traverse data

1946-1950, undated

13

1

Notes: Fluid flow - scratch work

undated

13

2

Notes: Fluid flow - scratch work

undated

13

3

Notes: Fluid flow - scratch work

undated

13

4

Notes: Fluid flow and heat transfer

undated

13

5

Notes: Fluid flow - data treatment

undated

13

6

Notes: Fluid flow

1946, undated

13

7

Notes: Instrumentation

undated

13

8

Notes: Instrumentation

1943-1951, undated

13

9

Notes: Fluidization - notes and data treatment

1948, undated

13

10

Notes: Liquid - Liquid extraction - scratch work

undated

13

11

Notes: Chem. E. 662

1950, undated

13

12

Notes: Standard plots

undated

13

13

Notes: Fluid flow - notes on paper "Investigations on Frictional Resistance of Canvas covered by Plate" by C. Wieselberger

1950

13

14

Notes: Electrokinetics

1951, undated

13

15

Notes: Settling - notes on research on compression of particle beds, extension of batch filtration to filters, cloth filtration and electrokinetics

1951, undated

13

16

Notes: Tiller's filtration

1946-1951, undated

13

17

Notes: Chem. E. 53 - filtration data and hectograph

undated

14

1

Notes: Residue of trials on paper and Bernoulli's Theorem

1945-1952, undated

14

2

Notes: Fluid flow - notes and problems

1940-1949, undated

14

3

Notes: Fluid flow

1933-1949, undated

14

4

Notes: Fluid flow

1949-1951, undated

14

5

Notes: Chem. E. 599

1951-1952, undated

15

1

Notes: Filtration

1933-1953, undated

15

2

Notes: Filtration

1933-1951, undated

15

3

Notes: Chem. E. 653

1947, undated

15

4

Notes: Miscellaneous

1942-1951, undated

15

5

Notes: Drying

1949-1953, undated

15

6

Notes: Chem. E. 652 - pipe roughness

1940-1951, undated

16

1

Notes: Periodic table

undated

16

2

Notes: Chem. E. 661 - fascicle of notes

1949-1953

16

3

Publications: Tracings from "An Extension of the Testing Methods and Equations of Batch Filtration Practice to the Field of Continuous Filtration" by Ruth and Kempe

1937

16

4

Notes: Filtration - notes and data treatment

1929-1931, undated

16

5

Notes: Filtration - tracings of unidentified material

undated

16

6

Notes: Filtration - Studies in Filtration III. The Nature of Fluid Flow through Filtering Septa During the Initial Stages of Filtration and its Importance in the Filtration Equation

undated

16

7

Research: Compression permeability test data

1933, undated

16

8

Notes: Filtration - criticism and counter criticism on paper "Studies in Filtration" by Ruth, Montana, and Montillon

1933, undated

16

9

Notes: Filtration - notes concerning initial filtration rates and plugging of media

undated

16

10

Notes: Flow through porous media

1932-1933, undated

16

11

Notes: Filtration - ferric hydroxide

1934-1935, undated

16

12

Notes: Filtration - notes on variable area in filtration, average pressure on drum filter

undated

16

13

Notes: Filtration - old manuscript for Paper VI, discussion on compression permeability test

undated

16

14

Notes: Filtration - notes including derivation of filtration resistance from compression permeability testing and data on ferric hydroxide filtration

undated

17

1

Notes: Filtration

undated

17

2

Notes: Filtration

undated

17

3

Notes: Genetic chart of matter

1960, undated

17

4

Notes: Sedimentation

1935, undated

17

5

Publications: "Studies in Filtration V: Apparatus and Methods for the Precision Measurement of Filtration Test Performance" by B.F. Ruth and R.E. Miller

undated

17

6

Publications: "Studies in Filtration V: Apparatus and Methods for the Precision Measurement of Filtration Test Performance" by B.F. Ruth and R.E. Miller

1935, undated

17

7

Notes: Electrokinetics

1931

17

8

Research: Filtration - filtercel and CaCO3

1932, undated

17

9

Research: Filtration - compound constant pressure test

1931, undated

17

10

Notes: Filtration

1930-1931, undated

17

11

Research: Particle size analysis by sedimentation - McDougall's method

undated

17

12

Research: Tube filtrations (permeability), data and notes

1931, undated

17

13

Notes: Filtration - Back pressure

1930, undated

17

14

Notes: Filtration - data and papers by other authors

1927-1932, undated

18

1

Research: Filtration - CaCO3 data

1930-1931, undated

18

2

Research: Filtration - R-IV data sheets

1950, undated

18

3

Research: Filtration - analysis method on R-IV, correlation of constant rate and constant pressure

1931-1932, undated

18

4

Notes: Filtration - notes and speculations on Mayette's thesis

1931-1933, undated

18

5

Publications: Ruth's thesis

undated

18

6

Research: Flow through porous beds, data and notes

1932, undated

18

7

Notes: Sedimentation - MacDouglas' notes on Plumb Bob method

undated

18

8

Notes: Filtration - notes on paper by Honing and W. Thomson "The Technique and Handling of Unpurified Natural Juice of Sugar Plants in Various Manufacturing Plants"

1929, undated

18

9

Research: Filtration - data and graphs used in Studies I and II

1931, undated

18

10

Research: Filtration - Ferric Hydroxide and Ferric Hydroxide + Hyflow

undated

18

11

Research: Filtration - CaCO3, constant pressure, C-determination

1928-1930, undated

18

12

Research: Filtration - Filtercel, determination of "m"

1930

18

13

Research: Filtration - Filtercel, data treated by method

1930, undated

18

14

Research: Filtration - Filtercel, data illustrates incompressibility

1930-1931, undated

18

15

Notes: Filtration - cake closure, sedimentation

1930

18

16

Notes: Filtration - compressibility

1930

18

17

Notes: Filtration - cloth resistance

1930-1931, undated

19

1

Research: Filtration - data on cloth resistance, function of filtrate passage volume

1933, undated

19

2

Research: Filtration - data from washing tests

1933

19

3

Research: Permeability - data on glass beads

1931-1932, undated

19

4

Research: Permeability - tube filtrations: sand, magnesite, CaCO3 and particle size

1931, undated

19

5

Notes: Filtration - Ruth's comments on paper by Herman and Bredzee "Zur Kenntnis der Filtrations-Gesetze" with letter and translation

1935, undated

19

6

Research: Permeability - Mayette and ball bearing

undated

19

7

Notes: Heat and Mass Transfer in Turbulent Flow, Book IV

undated

19

8

Notes: Heat and Mass Transfer in Turbulent Flow, Book IV

1946-1947

19

9

Notes: Heat and Mass Transfer in Turbulent Flow, Book IV

1948-1950

19

10

Notes: Heat and mass transfer lecture notes

1953

19

11

Notes: Heat and mass transfer lecture notes

1947, undated

19

12

Notes: Chem. E. 653

1951, undated

20

1

Notes: Thoughts, ideas, research

1939, 1951, undated

20

2

Research: Turbulent flow through granular porous beds

undated

20

3

Research: Cowles' research

undated

20

4

Research: True static pressure in moving gas streams

undated

20

5

Research: Calibration of pitot tubes

undated

20

6

Research: Movements of solids in fluids

undated

20

7

Research: Heat transfer and u/u

1947

20

8

Research: Turbulent flow velocity distribution

1957, undated

20

9

Research: Turbulent flow velocity distribution and mixture length

undated

20

10

Notes: Avoiding error in the application of Bernoulli's theorem to the flow of pressure gases

undated

20

11

Notes: Avoiding error in the application of Bernoulli's theorem to the flow of pressure gases

undated

20

12

Research: Capillary flow of moisture

1951

20

13

Research: Derivation of general law of settling when particle lyosphere exists

1951

20

14

Notes: Chem. Engr. 662

1949-1953, undated

20

15

Notes: Chem. Engr. 662

1949-1953, undated

20

16

Research: Multi-component rectification ideas

undated

20

17

Research: Fluid flow and heat transfer

1939, undated

20

18

Research: Brown's refractive index

1946, undated

21

1

Research: Kata thermometer

1941-1943, undated

21

2

Research: Kata thermometer

1943-1944

21

3

Notes: Fluid flow

1946-1947, undated

21

4

Notes: Drying

1939-1942, undated

21

5

Notes: Thermometry

1944, undated

21

6

Notes: Settling, fluidization, and porous media

1951, undated

21

7

Publications: Abstract of Albert L. Loeffler's dissertation "Mechanism of Hindred Settling and Fluidization"

1953

21

8

Notes: Filtration - Nelson's flow tester

1935

21

9

Publications: "The Absorption of Ammonia by Silica Gel" thesis by B.F. Ruth

1925

21

10

Publications: "Chemical Engineering Laboratory Experiments in Filtration" by G.H. Montillon and B.F. Ruth

1936

22

1

Notes: Manometer paper Mss.

1932-1957, undated

22

2

Research: Calibration data for the Bureau of Standards Thermometer

1929, undated

22

3

Publications: "A Simple and Inexpensive Precision Manometer for Infrequent and Emergency Pitot Tube Measurements"

undated

23

1

Notes: F. Bacon controversy

1924-1926

23

2

Correspondence: Letters and inquiries regarding the Bacon Society and Shakespeare books

1922-1976

23

3

Correspondence: Letters and news clippings from the Bacon Society to Mrs. Ruth

1949-1979

23

4

Correspondence: Bacon Society letters and book shipment materials

1949-1952

23

5

Correspondence: Hertzberg Bindery (Des Moines)

1949-1950

23

6

Correspondence: Quaritch Books (England)

1949-1953

23

7

News Clippings: Shakespeare, England, and other pamphlets

1955-1975

23

8

News Clippings: Dr. Owen's search and "Cipher"

1950 circa

23

9

Notes: F. Bacon-Shakespeare controversy, list of works used to decipher story

undated

23

10

Publications: Catalogue of Bacon-Shakespeare books

1954

23

11

Publications: Shakespeare journals

1948-1953

23

12

Publications: "Shakespeare's Comedies, Histories, and Tragedies" by Sidney Lee

1902

23

13

Publications: Works pertaining to F. Bacon

1916-1947

24

1

Lists: Library of Burrell F. Ruth

undated

24

2

Lists: Priced Catalog of the Woodward Library

1958

24

3

Correspondence: Raymond Shove's evaluation of Woodward Library

1958

24

4

Lists: Catalogue of books about Bacon vs. Shakespeare Question

undated

24

5

Lists: Receipts of books purchased for personal collection - "Baconiana"

1951-1953

24

6

Oak Island material

1951-1971

24

7

Writings: Various writings and speeches given by B.F. Ruth

undated

24

8

Publications: Ph.D. Thesis - "Studies in Filtration"

1931

24

9

Diploma - University of Minnesota

1931

24

10

Talks: Three talks given at ISU

1948-1949

24

11

Correspondence: Department correspondence concerning Ruth's death

1953

24

12

Correspondence: Correspondence and pamphlets concerning B.F. Ruth Chemical Engineering Research Symposium

1977-1979

25

1

Notes: Anagrams - Francis Bacon

1949, undated

25

2

Talks: Shakespeare Talks (1 of 2)

undated

25

3

Talks: Shakespeare Talks (2 of 2)

1949-1950, undated

25

4

Writings: Technical diaries

1933-1949