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
- 331 more...
- ItemStruc004560 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1973
- ItemStruc004561 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1973
- ItemStruc004562 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004563 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004564 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004565 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004566 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004567 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004568 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 12 more...