Charles R. Pettyjohn Engineering Student Notebooks, #37-5-4175. Division of Rare and Manuscript Collections, Cornell University Library.
Cite Item Description
Charles R. Pettyjohn Engineering Student Notebooks, #37-5-4175. Division of Rare and Manuscript Collections, Cornell University Library. https://archives.library.cornell.edu/repositories/2/resources/7856 Accessed August 20, 2026.
