Leopold Tschirky patent, 1761m, manuscript box: 11 - folder 1. Division of Rare and Manuscript Collections.
Leopold Tschirky patent, 1761m, manuscript box: 11 - folder 1. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/resources/7596 Accessed November 29, 2024.
