Railroad Archives Online
- CollectionE0479 - Great Northern Railway Public Relations Photos
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 114 - Photographs
- Subseries Level 24 - Railroad tracks
- Subseries Level 31 - Railroad mainline
- ItemPR.MoW.46 - Great Northern Tracks at Rexford, Montana, July 1959