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
- 340 more...
- ItemStruc004569 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004570 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004571 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004572 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004573 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004574 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004575 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004576 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004577 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1975
- 3 more...