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
- 296 more...
- ItemStruc004525 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004526 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004527 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004528 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004529 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004530 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004531 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004532 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- ItemStruc004533 - Great Northern Engineering Drawing, Flathead Tunnel, Montana, 1971
- 47 more...