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
- 6631 more...
- ItemBB028595 - Northern Pacific Engineering Drawing: Detail of Longitudinal Brace, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028596 - Northern Pacific Engineering Drawing: Detail of Longitudinal Brace, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028597 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028598 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028599 - Northern Pacific Engineering Drawing: Detail of Plate Girder/Casting, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028600 - Northern Pacific Engineering Drawing: Detail of Plate Girder/Casting, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028601 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028602 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 52, West of Spire Rock, Montana, undated
- ItemBB028603 - Northern Pacific Engineering Drawing: Shop Plan - Platform Detail, Bridge 1 - Columbia River, West of Pasco, Washington, undated
- 1088 more...