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
- 303 more...
- ItemStruc004532 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004533 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004534 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004535 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004536 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004537 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004538 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004539 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004540 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 40 more...