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
- 6768 more...
- ItemBB028735 - Northern Pacific Engineering Drawing: Detail of Bent 8, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028736 - Northern Pacific Engineering Drawing: Detail of Bents 9, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028737 - Northern Pacific Engineering Drawing: Detail of Bents 11, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028738 - Northern Pacific Engineering Drawing: Detail of Longitudinal Brace, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028739 - Northern Pacific Engineering Drawing: Detail of Longitudinal Brace, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028740 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028741 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 51 (50), West of Spire Rock, Montana, undated
- ItemBB028742 - Northern Pacific Engineering Drawing: Shop Plan - Floor Beam, Bridge 218 - Clark Fork River, West of Quinns, Montana, undated
- ItemBB028743 - Northern Pacific Engineering Drawing: Shop Plan - Floor Beam, Bridge 218 - Clark Fork River, West of Quinns, Montana, undated
- 951 more...