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
- 207 more...
- 物件Struc001646 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001647 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1950
- 物件Struc001648 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001649 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 物件Struc001650 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 物件Struc001651 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 物件Struc001652 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 物件Struc001653 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 物件Struc001654 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 136 more...