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
- 27 more...
- 物件Struc001446 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001447 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001448 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001449 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001450 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001451 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001452 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001453 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001454 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 316 more...