Railroad Archives Online
- ArquivoD0027 - Timothy Miller Collection
- Série003 - Great Northern Railway Company (U.S.)
- Subsérie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 147 mais...
- ItemStruc001566 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001567 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001568 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001569 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001570 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001571 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001572 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001573 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001574 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 196 mais...