Railroad Archives Online
- FondE0480 - Great Northern Railway Historical Society Miscellaneous Collection
- Sorozat003 - Great Northern Railway Company (U.S.)
- Alsorozat008 - Ephemera
- IratdarabEMPIRE BUILDER RADIO STORY CONTEST - Empire Builder Radio Story Contest Pamphlet, 1929
- IratdarabTHE EMPIRE BUILDER RADIO - Advertising Pamphlet for "The Empire Builders", 1929
- IratdarabWESTWARD TIDE - Radio Show Script for "The Westward Tide", 1929