Railroad Archives Online
- FondiD0027 - Timothy Miller Collection
- Serija003 - Great Northern Railway Company (U.S.)
- Podserija009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 140 more...
- DokumentStruc001559 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001560 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001561 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001562 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001563 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001564 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001565 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001566 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001567 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 203 more...