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
- 262 more...
- ItemStruc004491 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004492 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004493 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004494 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004495 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004496 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1970
- ItemStruc004497 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004498 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004499 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 81 more...