Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3008 - Tunnels
- 206 more...
- ItemStruc001645 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- ItemStruc001646 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001647 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1950
- ItemStruc001648 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001649 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001650 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001651 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001652 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001653 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 137 more...