History of the School of Mechanical Engineering, and edited versions of Purdue University: Fifty Years of Progress Part II (unpublished) by William Murray Hepburn, Librarian and Louis Martin Sears, Professor of History, Chapter 1, The School of Mechanical Engineering, 1923 - 1924

History of the School of Mechanical Engineering, and edited versions of Purdue University: Fifty Years of Progress Part II (unpublished) by William Murray Hepburn, Librarian and Louis Martin Sears, Professor of History, Chapter 1, The School of Mechanical Engineering, 1923 - 1924, MSF 521, Series 1, Sub-Series 2, File 4, Box: 2, Folder: 4. Horton B. Knoll papers, MSF 521. Purdue University Archives and Special Collections. https://archives.lib.purdue.edu/repositories/2/archival_objects/31597 Accessed April 29, 2025.