Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Série004 - Northern Pacific Railroad Company
- Sous-série009 - Engineering Records
- 008 - Physical plant drawing
- 001 - Bridges
- 1387 en plus...
- PièceBB015718 - Northern Pacific Engineering Drawing: Safety Bridge Across Highway, Bridge 134 (169), West of Chestnut, Montana, undated
- PièceBB015719 - Northern Pacific Engineering Drawing: General Plan/Detail, Bridge 54 - Shippy Creek, West of Perma, Montana, 1926
- PièceBB015720 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 58 - Palouse River, West of Perma, Washington, 1947
- PièceBB015722 - Northern Pacific Engineering Drawing: Replace Span With Girder, Bridge 58 - Palouse River, West of Perma, Washington, undated
- PièceBB015723 - Northern Pacific Engineering Drawing: Shop Plan - Girder, etc., Bridge 58 - Palouse River, West of Perma, Washington, undated
- PièceBB015724 - Northern Pacific Engineering Drawing: Shop Plan - Lateral, etc., Bridge 58 - Palouse River, West of Perma, Washington, undated
- PièceBB015725 - Northern Pacific Engineering Drawing: Standard Plan Deck Plate Girder (DPG), Bridge 58 - Palouse River, West of Perma, Washington, undated
- PièceBB015726 - Northern Pacific Engineering Drawing: Standard Detail End Bearing, Bridge 58 - Palouse River, West of Perma, Washington, undated
- PièceBB015727 - Northern Pacific Engineering Drawing: Bill of Material, Bridge 58 - Palouse River, West of Perma, Washington, undated
- 6332 en plus...