Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3001 - Bridges
- 2201 more...
- ItemBB016646 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 18 - Boulder River, East of Oso, Washington, 1955
- ItemBB016647 - Northern Pacific Engineering Drawing: Shop Plan - Erection Diagram, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016648 - Northern Pacific Engineering Drawing: Shop Plan - Through Truss Spacing, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016649 - Northern Pacific Engineering Drawing: Shop Plan - Miscellaneous, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016650 - Northern Pacific Engineering Drawing: Shop Plan - Through Truss Spacing, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016651 - Northern Pacific Engineering Drawing: Shop Plan - Through Truss Spacing, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016652 - Northern Pacific Engineering Drawing: Shop Plan - Through Truss Spacing, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016653 - Northern Pacific Engineering Drawing: Repair to Top Chord Truss Span, Bridge 18 - Boulder River, East of Oso, Washington, undated
- ItemBB016654 - Northern Pacific Engineering Drawing: Shop Plan - Bars, etc., Bridge 113.1 - Big Blackfoot River, West of Bonner, Montana, undated
- 5518 more...