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
- 126 more...
- Itemimg541 - Great Northern Boxcar 39672 at Denver, Colorado, 1978
- Itemimg542 - Great Northern Boxcar 39805 at Denver, Colorado, 1978
- Itemimg543 - Great Northern Boxcar 39836 at Belen, New Mexico, 1981
- Itemimg544 - Great Northern Boxcar 39887 at Pasco, Washington, 1981
- 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
- 384 more...