Correspondence between Stuart Otto and Professor Ing R. Plank of the Kältetechnische Institute of Karlsruhe,, 1926-1934

Correspondence between Stuart Otto and Professor Ing R. Plank of the Kältetechnische Institute of Karlsruhe,, 1926-1934, Box: 1, Folder: 14. Stuart Otto papers, 2389. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/366493 Accessed January 14, 2026.