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
- 2528 more...
- ItemBB017012 - Northern Pacific Engineering Drawing: Shop Plan - Detail Floor Beam, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017013 - Northern Pacific Engineering Drawing: Shop Plan - Beds/Lateral, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017014 - Northern Pacific Engineering Drawing: Shop Plan - Shoe, etc., Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017015 - Northern Pacific Engineering Drawing: Present Position of River, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017016 - Northern Pacific Engineering Drawing: High Water Cross Section, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017017 - Northern Pacific Engineering Drawing: Proposed Location/Arrangement, Bridge 113 - Big Blackfoot River, West of Bonner, Montana, undated
- ItemBB017018 - Northern Pacific Engineering Drawing: Detail of Piers, Bridge 113 - Big Blackfoot River, West of Bonner, Montana, undated
- ItemBB017019 - Northern Pacific Engineering Drawing: Detail of Abutments, Bridge 113 - Big Blackfoot River, West of Bonner, Montana, undated
- ItemBB017021 - Northern Pacific Engineering Drawing: Eastbound Main Line, Bridge 113 - Big Blackfoot River, West of Bonner, Montana, undated
- 5191 more...