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
- 422 more...
- Itemimg851 - Great Northern Covered Hopper Car 172571 at Amarillo, Texas, 1992
- Itemimg852 - Great Northern Covered Hopper Car 172621 at Pasco, Washington, 1988
- Itemimg853 - Great Northern Covered Hopper Car 172632 at Denver, Colorado, 1990
- Itemimg854 - Great Northern Covered Hopper Car 172691 at Denver, Colorado, 1971
- Itemimg855 - Great Northern Covered Hopper Car 173884 at Wishram, Washington, 1988
- Itemimg856 - Great Northern Covered Hopper Car 173901 at Denver, Colorado, 1976
- Itemimg857 - Great Northern Covered Hopper Car 173898 at Wishram, Washington, 1988
- Itemimg858 - Great Northern Covered Hopper Car 173902 at Prosser, Washington, 1986
- Itemimg859 - Great Northern Covered Hopper Car 173962, undated
- 88 more...