Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- 270 more...
- Itemimg699 - Great Northern Hopper Car 70238 at Trinidad, Colorado, 1990
- Itemimg700 - Great Northern Hopper Car 70278 at Albuquerque, New Mexico, 1980
- Itemimg701 - Great Northern Hopper Car 70279 at Albuquerque, New Mexico, 1978
- Itemimg702 - Great Northern Hopper Car 70280 at Longmont, Colorado, 1990
- Itemimg703 - Great Northern Hopper Car 70295 at Denver, Colorado, 1984
- Itemimg704 - Great Northern Hopper Car 70336 at Longmont, Colorado, 1981
- Itemimg705 - Great Northern Hopper Car 70350 at Longmont, Colorado, 1981
- Itemimg706 - Great Northern Hopper Car 70350 at Longmont, Colorado, 1981
- Itemimg707 - Great Northern Hopper Car 70352 at Pasco, Washington, 1984
- 240 more...