Railroad Archives Online
- FondoD0237A - Great Northern Railway Historical Society Cascade Division Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie013 - Operations documents
- 012 - Bulletins
- Unità documentariaGNRHSCD260 - Great Northern Cascade Division Operating Bulletins, January 1, 1960
- Unità documentariaGNRHSCD261 - Great Northern Cascade Division Operating Circulars, January 1, 1960
- Unità documentariaGNRHSCD262 - Great Northern Cascade Division Operating Bulletins and Circulars, January 1, 1962
- Unità documentariaGNRHSCD292 - Great Northern Spokane Division Bulletin, 1946