Source: Google Books
Historical Records
Annual Report of the Director General of Railroads – 1919
Annual Report of Walker D. Hines
Director General of Railroads
1919
Source: Google Books
Proceedings of the American Railroad Association Mechanical Section (1919)
Proceedings of the Session of the
American Railroad Association
Mechanical Section(6/18/1919-6/25/1919)
Source: https://babel.hathitrust.org/cgi/pt?id=hvd.hnte3y&view=1up&seq=5
AAR Organizations and Activities (1939)
The Association of American Railroads
It’s Organization and Activities
Source: https://babel.hathitrust.org/cgi/pt?id=mdp.39015022728227&view=1up&seq=1