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
- 96 more...
- Itemimg511 - Great Northern Boxcar 13325 at Denver, Colorado, 1978
- Itemimg512 - Great Northern Boxcar 13332 at Denver, Colorado, 1965
- Itemimg513 - Great Northern Boxcar 13356 at Albuquerque, New Mexico, 1981
- Itemimg514 - Great Northern Boxcar 13404 at Albuquerque, New Mexico, 1977
- Itemimg515 - Great Northern Boxcar 13464 at Denver, Colorado, 1966
- Itemimg516 - Great Northern Boxcar 13487 at Albuquerque, New Mexico, 1981
- Itemimg517 - Great Northern Boxcar 4329 at Bellingham, Washington, 1977
- Itemimg518 - Great Northern Boxcar 4389 at Bellingham, Washington, 1977
- Itemimg519 - Great Northern Boxcar 4408 at Albuquerque, New Mexico, 1978
- 414 more...