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
- 21 more...
- Itemimg436 - Great Northern Boxcar 18670 at Denver, Colorado, 1967
- Itemimg437 - Great Northern Boxcar 18687 at Albuquerque, New Mexico, 1980
- Itemimg438 - Great Northern Boxcar 18894 at Albuquerque, New Mexico, 1980
- Itemimg439 - Great Northern Boxcar 19015 at Denver, Colorado, 1965
- Itemimg440 - Great Northern Boxcar 19164 at Denver, Colorado, 1965
- Itemimg441 - Great Northern Boxcar 20610 at Belen, New Mexico, 1980
- Itemimg442 - Great Northern Boxcar 21307 at Boulder, Colorado, 1965
- Itemimg443 - Great Northern Boxcar 21483 at Denver, Colorado, 1965
- Itemimg444 - Great Northern Boxcar 21492 at Belen, New Mexico, 1980
- 489 more...