Railroad Archives Online
- ArquivoD0027 - Timothy Miller Collection
- Série003 - Great Northern Railway Company (U.S.)
- Subsérie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 48 mais...
- ItemStruc001467 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001468 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001469 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001470 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001471 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001472 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001473 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001474 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001475 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 295 mais...