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
- 147 more...
- ItemBB014368 - Northern Pacific Engineering Drawing: Sketch Proposed Steel Bridge, Bridge 55 - Flathead River, West of Perma, Montana, 1899
- ItemBB014369 - Northern Pacific Engineering Drawing: General Plan, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014370 - Northern Pacific Engineering Drawing: Detail of Pier/Abutment, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014371 - Northern Pacific Engineering Drawing: General Arrangement Brace Seats, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014372 - Northern Pacific Engineering Drawing: Proposed Pier/Abutment Brace, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014373 - Northern Pacific Engineering Drawing: Permanent Crossing East Abutment, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014374 - Northern Pacific Engineering Drawing: Permanent Crossing Pier 1, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014375 - Northern Pacific Engineering Drawing: Permanent Crossing Pier 3, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014376 - Northern Pacific Engineering Drawing: Permanent Crossing West Abutment, Bridge 55 - Flathead River, West of Perma, Montana, undated
- 7572 more...