Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- 133 more...
- ItemWerkema236 - Northern Pacific wood chip car 582536 at Pasco, Washington, in 1983.
- ItemWerkema237 - Northern Pacific wood chip car 582599 at Priest River, Idaho, in 1990.
- ItemWerkema238 - Northern Pacific wood chip car 582630 at Newcastle, Wyoming, in 1999.
- ItemWerkema239 - Northern Pacific wood chip car 582649 at Albuquerque, New Mexico, in 1995.
- ItemWerkema240 - Northern Pacific wood chip car 582649 at Albuquerque, New Mexico, in 1995.
- ItemWerkema241 - Northern Pacific wood chip car 582678 at Pasco, Washington, in 1983.
- ItemWerkema242 - Northern Pacific flat car 62475 at Pasco, Washington, in October, 1971.
- ItemWerkema243 - Northern Pacific flat car 62467 at Albuquerque, New Mexico, in 1980.
- ItemWerkema244 - Northern Pacific flat car 62853 at Denver, Colorado, in 1982.
- 81 more...