Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3008 - Tunnels
- 235 more...
- ItemStruc001674 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1951
- ItemStruc001675 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001676 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc004467 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1968
- ItemStruc004468 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1974
- ItemStruc004469 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1973
- ItemStruc004470 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1968
- ItemStruc004471 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1967
- ItemStruc004472 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1966
- 108 more...