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
- 310 more...
- ItemStruc004539 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004540 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004541 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004542 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004543 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004544 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004545 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004546 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004547 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 33 more...