Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 252 mer...
- ObjektStruc004481 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004482 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004483 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004484 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004485 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004486 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004487 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004488 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004489 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 91 mer...