Railroad Archives Online
- FondsD0036 - George Werkema Collection
- Série003 - Great Northern Railway Company (U.S.)
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 003 - Freight Cars
- 493 en plus...
- Pièceimg922 - Great Northern Woodchip Car 174348 at Wenatchee, Washington, 1992
- Pièceimg923 - Great Northern Woodchip Car 174410 at Wenatchee, Washington, 1992
- Pièceimg924 - Great Northern Flatcar 60108 at Boulder, Colorado, 1965
- Pièceimg925 - Great Northern Flatcar 60535 at Bellingham, Washington, 1977
- Pièceimg926 - Great Northern Flatcar 65292 at Denver, Colorado, 1965
- Pièceimg927 - Great Northern Flatcar 65707 at Castle Rock, Colorado, 1965
- Pièceimg928 - Great Northern Flatcar 64547 at Denver, Colorado, 1965
- Pièceimg929 - Great Northern Flatcar 64547 at Denver, Colorado, 1965
- Pièceimg930 - Great Northern Flatcar 64547 at Denver, Colorado, 1965
- 17 en plus...