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
- 150 more...
- Itemimg565 - Great Northern Boxcar 37304 at Denver, Colorado, 1980
- Itemimg566 - Great Northern Boxcar 37515 at Denver, Colorado, 1965
- Itemimg567 - Great Northern Boxcar 37528 at Albuquerque, New Mexico, 1978
- Itemimg568 - Great Northern Boxcar 37534 at Albuquerque, New Mexico, 1979
- Itemimg569 - Great Northern Boxcar 37559 at Albuquerque, New Mexico, 1979
- Itemimg570 - Great Northern Boxcar 37645 at Albuquerque, New Mexico, 1979
- Itemimg571 - Great Northern Boxcar 37719 at Albuquerque, New Mexico, 1978
- Itemimg572 - Great Northern Boxcar 37750 at Longmont, Colorado, 1980
- Itemimg573 - Great Northern Boxcar 37786 at Denver, Colorado, 1981
- 360 more...