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
- 1972 more...
- ItemBB016411 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 55 - Flathead River, West of Perma, Montana, 1958
- ItemBB016412 - Northern Pacific Engineering Drawing: Detail of Post/Chord, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016413 - Northern Pacific Engineering Drawing: Detail of Intermediate Post, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016414 - Northern Pacific Engineering Drawing: Detail of Chord/Post/Strut, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016415 - Northern Pacific Engineering Drawing: Detail of Pin/Rivet, etc., Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016416 - Northern Pacific Engineering Drawing: Detail of Portal/Brace, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016417 - Northern Pacific Engineering Drawing: Top of Bottom Lateral, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016418 - Northern Pacific Engineering Drawing: Erection Sketch, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB016419 - Northern Pacific Engineering Drawing: Reinforcement Top Chord/Floor Beam, Bridge 55 - Flathead River, West of Perma, Montana, undated
- 5747 more...