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
- 151 more...
- 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
- ItemBB014377 - Northern Pacific Engineering Drawing: Permanent Crossing Abutment, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014378 - Northern Pacific Engineering Drawing: Permanent Crossing Pier 1, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014379 - Northern Pacific Engineering Drawing: Permanent Crossing Pier 2/3, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014380 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 55 - Flathead River, West of Perma, Montana, 1938
- 7568 more...