Railroad Archives Online
- FondoD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 99 in più...
- Unità documentariaStruc001518 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1975
- Unità documentariaStruc001519 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1975
- Unità documentariaStruc001520 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001521 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001522 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001523 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- Unità documentariaStruc001524 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001525 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001526 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 244 in più...