Railroad Archives Online
- FondoD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 182 in più...
- Unità documentariaStruc001601 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001602 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001603 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001604 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001605 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001606 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001607 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Unità documentariaStruc001608 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Unità documentariaStruc001609 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 161 in più...