Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroad Buildings and Structures
- Subseries Level 3001 - Bridges
- ItemJMF02-03714.1 - Bridge No. 60 on the Northern Pacific Stampede line at Lester, Washington, circa 1940.
- ItemJMF04-02506.1 - Aerial photo of Tacoma, Washington, circa 1957.
- ItemJMF04-02570.1 - Northern Pacific truss bridge at Kent, Washington, in September 28, 1924.
- ItemJMF04-02589.1 - Northern Pacific truss bridge at Eagle Gorge, Washington, in June 20, 1925.
- ItemJMF04-02603.0 - Northern Pacific bridge at Kelly Butte, Washington, in 1969.
- ItemJMF04-02668.0 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- ItemJMF04-02669.0 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- ItemJMF04-02669.1 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- ItemJMF04-02670.0 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- 70 more...