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
- 3164 more...
- ItemBB017740 - Northern Pacific Engineering Drawing: General Plan, Bridge 1 - State Boulevard, Helena, Montana, 1964
- ItemBB017741 - Northern Pacific Engineering Drawing: Steel Spans S1 West and S5 East, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017742 - Northern Pacific Engineering Drawing: Steel Spans S1 East and S5 West, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017743 - Northern Pacific Engineering Drawing: Steel Spans S3 East and S3 West, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017744 - Northern Pacific Engineering Drawing: Steel Spans S2 East and S2 West, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017745 - Northern Pacific Engineering Drawing: Steel Bents, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017746 - Northern Pacific Engineering Drawing: Bill of Material, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017747 - Northern Pacific Engineering Drawing: Shop Plan - Steel Spans, Bridge 1 - State Boulevard, Helena, Montana, undated
- ItemBB017748 - Northern Pacific Engineering Drawing: Rebuild Bridge, Bridge 16 - 68th Street, South of Kirkland, Washington, 1966
- 4555 more...