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
- 2663 more...
- ItemBB017149 - Northern Pacific Engineering Drawing: Shop Plan - Girder, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017150 - Northern Pacific Engineering Drawing: Shop Plan - Floor Beam/Stringer, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017151 - Northern Pacific Engineering Drawing: Shop Plan - Floor Beam, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017152 - Northern Pacific Engineering Drawing: Shop Plan - Beds/Lateral, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017153 - Northern Pacific Engineering Drawing: Shop Plan - Shoes, etc., Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017154 - Northern Pacific Engineering Drawing: Standard Plan Deck Plate Girder (DPG), Bridge 113.1 - Big Blackfoot River, West of Bonner, Montana, undated
- ItemBB017155 - Northern Pacific Engineering Drawing: Deck Plate Girder (DPG) Spans, Bridge 113.1 - Big Blackfoot River, West of Bonner, Montana, undated
- ItemBB017156 - Northern Pacific Engineering Drawing: Deck Plate Girder/Through Plate Span, Bridge 113.1 - Big Blackfoot River, West of Bonner, Montana, undated
- ItemBB017157 - Northern Pacific Engineering Drawing: Shop Plan - Pin Span, Bridge 113.1 - Big Blackfoot River, West of Bonner, Montana, undated
- 5056 more...