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
- 4 more...
- 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.
- ItemJMF04-02720.0 - Martin, Washington, circa 1939.
- ItemJMF04-02727.0 - Northern Pacific footbridge at Martin, Washington, in 1943.
- ItemJMF04-02728.0 - Northern Pacific footbridge at Martin, Washington, in 1945.
- ItemJMF04-02806.1 - Northern Pacific bridge at Cle Elum, Washington Territory, in 1887.
- 66 more...