Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel locomotives
- ItemJMF03-01841.0 - Northern Pacific diesel locomotive number 98 at South Tacoma, Washington, circa 1950.
- ItemJMF03-01841.1 - Northern Pacific diesel locomotive number 98 at Tacoma, Washington, in 1955.
- ItemJMF03-01842.0 - Northern Pacific diesel locomotive number 100 at Seattle, Washington, circa 1939.
- ItemJMF03-01843.0 - Northern Pacific diesel locomotive number 100 at Brainerd, Minnesota, in 1950.
- ItemJMF03-01844.0 - Northern Pacific diesel locomotive number 101 at Seattle, Washington, in 1944.
- ItemJMF03-01845.0 - Northern Pacific diesel locomotive number 101 at Northtown, Minnesota, in 1954.
- ItemJMF03-01846.0 - Northern Pacific diesel locomotive number 107 circa 1950.
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