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
- 2506 more...
- ItemBB016989 - Northern Pacific Engineering Drawing: General Plan, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016990 - Northern Pacific Engineering Drawing: General Plan, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016991 - Northern Pacific Engineering Drawing: General Plan, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016992 - Northern Pacific Engineering Drawing: Detail of Abutments, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- ItemBB016993 - Northern Pacific Engineering Drawing: General Plan/Pier/Abutment, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, 1909
- ItemBB016994 - Northern Pacific Engineering Drawing: General Plan/Pier/Abutment, Bridge 87 (139) - Hell Gate River, West of Bearmouth, Montana, undated
- 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
- 5213 more...