Railroad Archives Online
- FondiD0027 - Timothy Miller Collection
- Serija003 - Great Northern Railway Company (U.S.)
- Podserija009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 101 more...
- DokumentStruc001520 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001521 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001522 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001523 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- DokumentStruc001524 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001525 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- DokumentStruc001526 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001527 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001528 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 242 more...