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
- 286 more...
- ItemStruc004515 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 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
- 57 more...