Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 292 mer...
- ObjektStruc004521 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004522 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004523 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004524 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004525 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004526 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004527 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004528 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ObjektStruc004529 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 51 mer...