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
- 138 more...
- アイテムStruc001557 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001558 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001559 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001560 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001561 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001562 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001563 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001564 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- アイテムStruc001565 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 205 more...