"Methods on the Mail Routes: British & American Needs and Tendencies," by Major R. H. Mayo; reprinted from "The Times Trade & Engineering Supplement", 1934-01-27

"Methods on the Mail Routes: British & American Needs and Tendencies," by Major R. H. Mayo; reprinted from "The Times Trade & Engineering Supplement", 1934-01-27, Box: 10. 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/106303 Accessed December 20, 2024.