10 February 1931; schedule for training of Group I and Group II pilots and observers for summer 1931, 1930

10 February 1931; schedule for training of Group I and Group II pilots and observers for summer 1931, 1930, Box: 1, Folder: 4. Carl B. Allen Papers Regarding Early Aviation, A&M 2252. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/94242 Accessed December 20, 2024.