Railroad Archives Online
- フォンドD0027 - Timothy Miller Collection
- シリーズ003 - Great Northern Railway Company (U.S.)
- サブシリーズ009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 227 more...
- アイテムStruc001666 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- アイテムStruc001667 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001668 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001669 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001670 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001671 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001672 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- アイテムStruc001673 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- アイテムStruc001674 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1951
- 116 more...