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
- 324 more...
- ItemStruc004553 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004554 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004555 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004556 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004557 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004558 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004559 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004560 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1973
- ItemStruc004561 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1973
- 19 more...