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
- 272 more...
- ItemStruc004501 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004502 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004503 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004504 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004505 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004506 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004507 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004508 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004509 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 71 more...