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 3007 - Track
- 108 more...
- ItemBB019742 - Northern Pacific Engineering Drawing: Extension Concrete Box, Culvert, Near Rapids, Montana, 1960
- ItemBB019743 - Northern Pacific Engineering Drawing: Extension Concrete Box, Culvert, Near Rapids, Montana, 1960
- ItemBB019744 - Northern Pacific Engineering Drawing: Irrigation Ditch Siphon, Syphon, Near Quebec, Montana, undated
- ItemBB019746 - Northern Pacific Engineering Drawing: Concrete Cribbing, Cribbing, West of Cyr, Montana, undated
- ItemBB019747 - Northern Pacific Engineering Drawing: Proposed Extension Concrete Arch, Concrete Arch, Near Rathdrum, Idaho, undated
- ItemBB019748 - Northern Pacific Engineering Drawing: Proposed Multiplate Extension, Concrete Arch, Near Rathdrum, Idaho, undated
- ItemBB019749 - Northern Pacific Engineering Drawing: Culvert Work, Culverts near Noxon Dam, Montana, undated
- ItemBB019750 - Northern Pacific Engineering Drawing: Replace West Culvert, Culvert at Milepost 7 ( west of Sandpoint), West of Sandpoint, Idaho, undated
- ItemBB020727 - Northern Pacific Engineering Drawing: Proposed Double Timber Box, Culvert, West of De Smet, Montana, undated
- 211 more...