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
- 130 more...
- Itemimg545 - Great Northern Boxcar 39895 at Longmont, Colorado, 1980
- Itemimg546 - Great Northern Boxcar 35362 at Denver, Colorado, 1965
- Itemimg547 - Great Northern Boxcar 35625 at Boulder, Colorado, 1978
- Itemimg548 - Great Northern Boxcar 35930 at Albuquerque, New Mexico, 1978
- Itemimg549 - Great Northern Boxcar 38813 at Boulder, Colorado, 1965
- Itemimg550 - Great Northern Boxcar 40176 at Denver, Colorado, 1966
- Itemimg551 - Great Northern Boxcar 41612 at Boulder, Colorado, 1965
- Itemimg552 - Great Northern Boxcar 41612 at Boulder, Colorado, 1965
- Itemimg553 - Great Northern Boxcar 43595 at Acme, Washington, 1977
- 380 more...