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
- 273 more...
- 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
- Itemimg708 - Great Northern Hopper Car 70374 at Longmont, Colorado, 1990
- Itemimg709 - Great Northern Hopper Car 70397 at Denver, Colorado, 1989
- Itemimg710 - Great Northern Hopper Car 70404 at Denver, Colorado, 1984
- 237 more...