Railroad Archives Online
- FondoD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 61 in più...
- Unità documentariaStruc001480 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Unità documentariaStruc001481 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Unità documentariaStruc001482 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- Unità documentariaStruc001483 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- Unità documentariaStruc001484 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1948
- Unità documentariaStruc001485 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- Unità documentariaStruc001486 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Unità documentariaStruc001487 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001488 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 282 in più...