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
- 104 more...
- ItemStruc001523 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- ItemStruc001524 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001525 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001526 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001527 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001528 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001529 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001530 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001531 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1956
- 239 more...