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
- 254 more...
- ItemStruc004483 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004484 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004485 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004486 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004487 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004488 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004489 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004490 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004491 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 89 more...