Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 73 mer...
- ObjektStruc001492 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001493 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001494 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- ObjektStruc001495 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001496 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001497 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001498 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001499 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001500 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 270 mer...