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 3003 - Freight cars
- 21 more...
- ItemJMF06-04206.0 - Northern Pacific Railroad Box Car Number 39561 at Tacoma, Washington in September 1969.
- ItemJMF06-04207.0 - Northern Pacific Railroad Box Car Number 44262 at Tacoma, Washington in September, 1969.
- ItemJMF06-04208.0 - Northern Pacific Railroad Log Flat Car Number 69318 at Unknown Location, circa 1925.
- ItemJMF06-04208.1 - Northern Pacific Railroad Refrigerator Car Number 94372 at Tacoma, Washington in September 1969.
- ItemJMF06-04209.0 - Northern Pacific Railroad Gondola Car Number 118749 at Tacoma, Washington in September 1969.
- ItemJMF06-04210.0 - Northern Pacific Railroad Box Car Number 119097 at Tacoma, Washington in September 1969.
- ItemJMF06-04211.0 - Northern Pacific Railroad Log Flat Car Number 121178 at Auburn, Washington in August, 1967.
- ItemJMF06-04212.0 - Northern Pacific Railroad Log Flat Car Number 122162 at Tacoma, Washington in November 1974.