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
- 3212 more...
- ItemBB017791 - Northern Pacific Engineering Drawing: Piers, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017792 - Northern Pacific Engineering Drawing: Plate Girders, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017793 - Northern Pacific Engineering Drawing: Bearing Details, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017794 - Northern Pacific Engineering Drawing: Bar List, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017795 - Northern Pacific Engineering Drawing: Metro Pipes Overcross, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017796 - Northern Pacific Engineering Drawing: Plan and Profile, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017797 - Northern Pacific Engineering Drawing: Details, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017798 - Northern Pacific Engineering Drawing: Construction Sequence 1, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- ItemBB017799 - Northern Pacific Engineering Drawing: Shop Plan - Erection Diagram, Bridge 11.1 - Mercer Slough, South of Wilburton, Washington, undated
- 4507 more...