Jewel C. Hardkopf papers, MSP 309, Box: 1; Box: 2; Box: 3; Box: 4; Box: 5. Purdue University Archives and Special Collections.
Jewel C. Hardkopf papers, MSP 309, Box: 1; Box: 2; Box: 3; Box: 4; Box: 5. Purdue University Archives and Special Collections. https://archives.lib.purdue.edu/repositories/2/resources/1245 Accessed May 25, 2025.
