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
- 2512 more...
- ItemBB016995 - Northern Pacific Engineering Drawing: Detail Pier/West Abutment, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016996 - Northern Pacific Engineering Drawing: Detail of Pier 1, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016997 - Northern Pacific Engineering Drawing: Detail of Pier 2, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016998 - Northern Pacific Engineering Drawing: Detail of Pier 3, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016999 - Northern Pacific Engineering Drawing: Detail of West Abutment, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017000 - Northern Pacific Engineering Drawing: Change Configuration Double Truss, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017001 - Northern Pacific Engineering Drawing: Detail Through Plate Girder Span, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017003 - Northern Pacific Engineering Drawing: General Plan, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB017004 - Northern Pacific Engineering Drawing: Through Plate Girder Span, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- 5207 more...