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
- 382 more...
- ItemBB014624 - Northern Pacific Engineering Drawing: Walk Details, Bridge 41 (63), West of Avon, Montana, undated
- ItemBB014625 - Northern Pacific Engineering Drawing: Miscellaneous, Bridge 41 (63), West of Avon, Montana, undated
- ItemBB014626 - Northern Pacific Engineering Drawing: Cross Frames, Bridge 41 (63), West of Avon, Montana, undated
- ItemBB014627 - Northern Pacific Engineering Drawing: Proposed Repairs, Bridge 41 (63), West of Avon, Montana, undated
- ItemBB014628 - Northern Pacific Engineering Drawing: Detail Plan Masonry Extension, Bridge 122A, West of Missoula, Montana, 1910
- ItemBB014629 - Northern Pacific Engineering Drawing: Plan of Abutments, Bridge 122, West of Missoula, Montana, 1901
- ItemBB014630 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 122, West of Missoula, Montana, 1956
- ItemBB014631 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 122, West of Missoula, Montana, undated
- ItemBB014632 - Northern Pacific Engineering Drawing: Detail Shims, Bridge 122, West of Missoula, Montana, undated
- 7337 more...