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
- 123 more...
- ItemBB028716 - Northern Pacific Engineering Drawing: Concrete Arch Undercrossing, Culvert, South of Ridgefield, Washington, undated
- ItemBB028717 - Northern Pacific Engineering Drawing: Concrete Arch Undercrossing, Culvert, South of Ridgefield, Washington, undated
- ItemBB028718 - Northern Pacific Engineering Drawing: Retaining Wall/Arch Barrel, Culvert, South of Ridgefield, Washington, undated
- ItemBB028885 - Northern Pacific Engineering Drawing: Concrete Box, Culvert, Near Martins Bluff, Washington, undated
- ItemBB029256 - Northern Pacific Engineering Drawing: Concrete Arch, Culvert (Standard Plan), South of Nisqually, Washington, undated
- ItemBB029257 - Northern Pacific Engineering Drawing: Reinforcement Concrete, Culvert (Standard Plan), South of Nisqually, Washington, undated
- ItemBB029258 - Northern Pacific Engineering Drawing: Reinforcement Concrete Box, Culvert (Standard Plan), Washington, undated
- ItemBB029259 - Northern Pacific Engineering Drawing: Reinforcement Concrete Box, Culvert (Standard Plan), Washington, undated
- ItemBB029260 - Northern Pacific Engineering Drawing: Reinforcement Concrete Box, Culvert (Standard Plan), Washington, undated
- 196 more...