Railroad Archives Online
- ArquivoD0027 - Timothy Miller Collection
- Série003 - Great Northern Railway Company (U.S.)
- Subsérie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 287 mais...
- ItemStruc004516 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004517 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004518 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004519 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004520 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004521 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004522 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004523 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004524 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 56 mais...