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
- 2908 more...
- ItemBB017439 - Northern Pacific Engineering Drawing: General Plans and Detail - Sub, Bridge 3 - 10 - Mile Creek, West of Helena, Montana, 1925
- ItemBB017440 - Northern Pacific Engineering Drawing: Girder Plan Details - Slab, Bridge 3 - 10 - Mile Creek, West of Helena, Montana, undated
- ItemBB017441 - Northern Pacific Engineering Drawing: Tie Plan, Bridge 3 - 10 - Mile Creek, West of Helena, Montana, undated
- ItemBB017442 - Northern Pacific Engineering Drawing: Details - Extension - Masonry, Bridge 3 - 10 - Mile Creek, West of Helena, Montana, undated
- ItemBB017443 - Northern Pacific Engineering Drawing: Details - Walk and Railing, Bridge 3 - 10 - Mile Creek, West of Helena, Montana, undated
- ItemBB017444 - Northern Pacific Engineering Drawing: Steel Bracing 30 Foot Deck Plate Girder (DPG), Bridge 3 - 10 - Mile Creek, West of Helena, Montana, undated
- ItemBB017445 - Northern Pacific Engineering Drawing: 30 Foot Deck Plate Girder (DPG) /44, Bridge 3 - 10 - Mile Creek, West of Helena, Montana, undated
- ItemBB017446 - Northern Pacific Engineering Drawing: General Plan, Bridge 128.1, West of De Smet, Montana, 1929
- ItemBB017447 - Northern Pacific Engineering Drawing: General and Masonry Plan, Bridge 36 - Clark Fork River, West of Thompson Falls, Montana, undated
- 4811 more...