Railroad Archives Online
- CollectionD0237A - Great Northern Railway Historical Society Cascade Division Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1013 - Operations documents
- Subseries Level 2012 - Bulletins
- ItemGNRHSCD260 - Great Northern Cascade Division Operating Bulletins, January 1, 1960
- ItemGNRHSCD261 - Great Northern Cascade Division Operating Circulars, January 1, 1960
- ItemGNRHSCD262 - Great Northern Cascade Division Operating Bulletins and Circulars, January 1, 1962
- ItemGNRHSCD292 - Great Northern Spokane Division Bulletin, 1946