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
- 192 more...
- ItemWerkema323 - Northern Pacific hopper car number 76328 at Lynden, Washington, in 1977.
- ItemWerkema324 - Northern Pacific hopper car number 76338 at Albuquerque, New Mexico, in 1979.
- ItemWerkema325 - Northern Pacific hopper car number 76395 at Amarillo, Texas, in 1980.
- ItemWerkema326 - Northern Pacific hopper car number 76404 at Amarillo, Texas, in 1979.
- ItemWerkema327 - Northern Pacific hopper car number 76440 at Pasco, Washington, in 1986.
- ItemWerkema328 - Northern Pacific hopper car number 76466 at Hastings, Nebraska, in 1990.
- ItemWerkema329 - Northern Pacific hopper car number 76481 at Plainview, Texas, in 1985.
- ItemWerkema330 - Northern Pacific hopper car number 76482 at Albuquerque, New Mexico, in 1980.
- ItemWerkema331 - Northern Pacific hopper car number 76502 at Amarillo, Texas, in 1980.
- 22 more...