Railroad Archives Online
- 宗卷D0027 - Timothy Miller Collection
- 系列003 - Great Northern Railway Company (U.S.)
- 次系列009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 129 more...
- 物件Struc001548 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 物件Struc001549 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 物件Struc001550 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- 物件Struc001551 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- 物件Struc001552 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- 物件Struc001553 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- 物件Struc001554 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- 物件Struc001555 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 物件Struc001556 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 214 more...