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
- 426 more...
- ItemBB014672 - Northern Pacific Engineering Drawing: End Post/Top Chord, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014673 - Northern Pacific Engineering Drawing: Bottom Chord/Diagonal/Lateral, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014674 - Northern Pacific Engineering Drawing: Post/Diagonals, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014675 - Northern Pacific Engineering Drawing: End Floor Beam/Stringers, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014676 - Northern Pacific Engineering Drawing: Struts/Laterals, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014677 - Northern Pacific Engineering Drawing: End Posts/Top Chord, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014678 - Northern Pacific Engineering Drawing: Posts/Diagonals, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014679 - Northern Pacific Engineering Drawing: Intermediate Floor Beam, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- ItemBB014680 - Northern Pacific Engineering Drawing: Outside Truss/Stress Sheet, Bridge 4.1 (7) - Madison River, West of Logan, Montana, undated
- 7293 more...