Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 26 mer...
- ObjektStruc001445 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001446 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001447 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001448 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001449 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001450 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001451 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001452 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001453 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 317 mer...