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
- 6030 more...
- ItemBB025689 - Northern Pacific Engineering Drawing: Abutments/Piers, Bridge 52 (54), West of Spire Rock, Montana, undated
- ItemBB025690 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 52 (54), West of Spire Rock, Montana, 1962
- ItemBB025691 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 52 (54), West of Spire Rock, Montana, 1962
- ItemBB025692 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 52 (54), West of Spire Rock, Montana, 1962
- ItemBB025693 - Northern Pacific Engineering Drawing: Detail of Plate Girder, Bridge 52 (54), West of Spire Rock, Montana, undated
- ItemBB025694 - Northern Pacific Engineering Drawing: Strain Sheet, Bridge 52 (54), West of Spire Rock, Montana, undated
- ItemBB025695 - Northern Pacific Engineering Drawing: Detail of Guard Rails, Bridge 52 (54), West of Spire Rock, Montana, undated
- ItemBB025696 - Northern Pacific Engineering Drawing: General Plan, Bridge 52 (54), West of Spire Rock, Montana, undated
- ItemBB025697 - Northern Pacific Engineering Drawing: Erection Diagram, Bridge 52 (54), West of Spire Rock, Montana, undated
- 1689 more...