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
- 6636 more...
- 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
- ItemBB028604 - Northern Pacific Engineering Drawing: Shop Plan - Tower Detail, Bridge 1 - Columbia River, West of Pasco, Washington, undated
- ItemBB028605 - Northern Pacific Engineering Drawing: Shop Plan - Tower Detail, Bridge 1 - Columbia River, West of Pasco, Washington, undated
- ItemBB028606 - Northern Pacific Engineering Drawing: Shop Plan - Tower Detail, Bridge 1 - Columbia River, West of Pasco, Washington, undated
- ItemBB028607 - Northern Pacific Engineering Drawing: Shop Plan - Tower Detail, Bridge 1 - Columbia River, West of Pasco, Washington, undated
- ItemBB028608 - Northern Pacific Engineering Drawing: Shop Plan - Tower Detail, Bridge 1 - Columbia River, West of Pasco, Washington, undated
- 1083 more...