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 3004 - Maintenance of Way Support
- ItemJMF04-02772.0 - Northern Pacific section house at Martin, Washington, circa 1948.
- ItemJMF04-02810.0 - Northern Pacific section house and workers at Easton, Washington Territory, in 1887.
- ItemJMF04-02820.0 - Northern Pacific section house at Canyon Spur, Washington Territory, 1887.
- ItemJMF04-02828.0 - Northern Pacific engineering offices on Stampede Pass, Washington Territory, 1887.
- ItemJMF04-03161.0 - Northern Pacific section house at Frances, Washington, circa 1915.