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
- 2333 more...
- ItemBB016784 - Northern Pacific Engineering Drawing: General Layout, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016785 - Northern Pacific Engineering Drawing: Layout Steel Construction, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016786 - Northern Pacific Engineering Drawing: Miscellaneous Details, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016787 - Northern Pacific Engineering Drawing: Abutments, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016788 - Northern Pacific Engineering Drawing: Pier Number 2, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016789 - Northern Pacific Engineering Drawing: Pier Number 3, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016790 - Northern Pacific Engineering Drawing: Piers 4/7/10/13/17, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016791 - Northern Pacific Engineering Drawing: Piers, First Avenue South Overpass, Seattle, Washington, undated
- ItemBB016792 - Northern Pacific Engineering Drawing: Fire Stop/Concrete Bent, First Avenue South Overpass, Seattle, Washington, undated
- 5386 more...