Railroad Archives Online
- FondsD0011 - James M. Fredrickson Collection
- Série004 - Northern Pacific Railroad Company
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 002 - Diesel locomotives
- PièceJMF03-01841.0 - Northern Pacific diesel locomotive number 98 at South Tacoma, Washington, circa 1950.
- PièceJMF03-01841.1 - Northern Pacific diesel locomotive number 98 at Tacoma, Washington, in 1955.
- PièceJMF03-01842.0 - Northern Pacific diesel locomotive number 100 at Seattle, Washington, circa 1939.
- PièceJMF03-01843.0 - Northern Pacific diesel locomotive number 100 at Brainerd, Minnesota, in 1950.
- PièceJMF03-01844.0 - Northern Pacific diesel locomotive number 101 at Seattle, Washington, in 1944.
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