Railroad Archives Online
- FondoD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 170 in più...
- Unità documentariaStruc001589 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Unità documentariaStruc001590 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001591 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001592 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001593 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001594 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001595 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001596 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001597 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 173 in più...