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
- 157 more...
- 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
- ItemBB014381 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 55 - Flathead River, West of Perma, Montana, 1938
- ItemBB014382 - Northern Pacific Engineering Drawing: Reinforce Top Chord, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014383 - Northern Pacific Engineering Drawing: Reinforce Floor Beams, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014384 - Northern Pacific Engineering Drawing: Detail of Placement Side Plate, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014385 - Northern Pacific Engineering Drawing: Detail of Brackets, Bridge 55 - Flathead River, West of Perma, Montana, undated
- ItemBB014386 - Northern Pacific Engineering Drawing: Telegraph Supports, Bridge 55 - Flathead River, West of Perma, Montana, undated
- 7562 more...