Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 235 mer...
- ObjektStruc001674 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1951
- ObjektStruc001675 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001676 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc004467 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1968
- ObjektStruc004468 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1974
- ObjektStruc004469 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1973
- ObjektStruc004470 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1968
- ObjektStruc004471 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1967
- ObjektStruc004472 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1966
- 108 mer...