Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- ItemJMF17-12830.4 - Great Northern Railway chip car at Seattle, Washington in 1975.