Railroad Archives Online
- FondoD0011 - James M. Fredrickson Collection
- Serie004 - Northern Pacific Railroad Company
- Sottoserie014 - Photographs
- 003 - Railroad Buildings and Structures
- 001 - Bridges
- 5 in più...
- Unità documentariaJMF04-02668.0 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- Unità documentariaJMF04-02669.0 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- Unità documentariaJMF04-02669.1 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- Unità documentariaJMF04-02670.0 - Northern Pacific viaduct at Weston, Washington, circa 1914.
- Unità documentariaJMF04-02720.0 - Martin, Washington, circa 1939.
- Unità documentariaJMF04-02727.0 - Northern Pacific footbridge at Martin, Washington, in 1943.
- Unità documentariaJMF04-02728.0 - Northern Pacific footbridge at Martin, Washington, in 1945.
- Unità documentariaJMF04-02806.1 - Northern Pacific bridge at Cle Elum, Washington Territory, in 1887.
- Unità documentariaJMF04-02806.2 - Northern Pacific trestle at Cle Elum, Washington Territory, in 1887.
- 65 in più...