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
- 27 more...
- 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
- Itemimg445 - Great Northern Boxcar 25478 at Park, Washington, 1977
- Itemimg446 - Great Northern Boxcar 25478 at Park, Washington, 1977
- Itemimg447 - Great Northern Boxcar 25478 at Wickersham, Washington, 1973
- Itemimg448 - Great Northern Boxcar 25478 at Wickersham, Washington, 1993
- Itemimg449 - Great Northern Boxcar 27522 at Chehalis, Washington, 1965
- Itemimg450 - Great Northern Boxcar 27556 at Bellingham, Washington, 1977
- 483 more...