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
- 118 more...
- Itemimg533 - Great Northern Boxcar 39515 at Denver, Colorado, 1966
- Itemimg534 - Great Northern Boxcar 7137 at Albuquerque, New Mexico, 1979
- Itemimg535 - Great Northern Boxcar 39523 at Albuquerque, New Mexico, 1978
- Itemimg536 - Great Northern Boxcar 39523 at Albuquerque, New Mexico, undated
- Itemimg537 - Great Northern Boxcar 39598 at Albuquerque, New Mexico, 1978
- Itemimg538 - Great Northern Boxcar 39602 at Albuquerque, New Mexico, 1979
- Itemimg539 - Great Northern Boxcar 39602 at Albuquerque, New Mexico, 1979
- Itemimg540 - Great Northern Boxcar 39641 at Itasca, Illinois, 1979
- Itemimg541 - Great Northern Boxcar 39672 at Denver, Colorado, 1978
- 392 more...