Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Teilserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
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- ObjektStruc001469 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001470 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001471 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001472 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001473 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001474 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001475 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001476 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- ObjektStruc001477 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 293 mehr...