Railroad Archives Online
- FondiD0027 - Timothy Miller Collection
- Serija003 - Great Northern Railway Company (U.S.)
- Podserija009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 23 more...
- DokumentStruc001442 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001443 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001444 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001445 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001446 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001447 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001448 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001449 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001450 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 320 more...