Railroad Archives Online
- CollectionD0237A - Great Northern Railway Historical Society Cascade Division Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1012 - Cartographic materials
- Subseries Level 2003 - Track profile
- 8 more...
- ItemGNRHSCD337 - Great Northern Profile Map 10, Cascade Summit to Skykomish, Washington, 1894
- ItemGNRHSCD338 - Great Northern Profile Map 11, Cascade Summit to Skykomish, Washington, 1894
- ItemGNRHSCD339 - Great Northern Profile Map 12, Cascade Summit to Skykomish, Washington, 1894
- ItemGNRHSCD340 - Great Northern Profile Map 13, Cascade Summit to Skykomish, Washington, 1894
- ItemGNRHSCD341 - Great Northern Profile Map 14, Cascade Summit to Skykomish, Washington, 1894
- ItemGNRHSCD342 - Great Northern Profile Map 15, Cascade Summit to Skykomish, Washington, 1894