Pan American Airways. "An Analysis of Hours of Flying and Illness Rates in the Flight Personnel of the Pan American Airways System" by Ross McFarland, April 20, 1946

Pan American Airways. "An Analysis of Hours of Flying and Illness Rates in the Flight Personnel of the Pan American Airways System" by Ross McFarland, April 20, 1946, Box: 192, Folder: 11. Ross A. McFarland Papers, FSC-1. Special Collections. https://wright.libraryhost.com/repositories/2/archival_objects/54109 Accessed November 23, 2024.