Railroad Archives Online
- FondD0036 - George Werkema Collection
- Sorozat003 - Great Northern Railway Company (U.S.)
- Alsorozat014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 003 - Freight Cars
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- Iratdarabimg717 - Great Northern Hopper Car 70565 at Denver, Colorado, 1989
- Iratdarabimg718 - Great Northern Hopper Car 70600, undated
- Iratdarabimg719 - Great Northern Hopper Car 70628 at Amarillo, Texas, 1976
- Iratdarabimg720 - Great Northern Hopper Car 73105 at Longmont, Colorado, 1974
- Iratdarabimg721 - Great Northern Hopper Car 73272, undated
- Iratdarabimg722 - Great Northern Hopper Car 73303, undated
- Iratdarabimg723 - Great Northern Hopper Car 73612 at Denver, Colorado, 1976
- Iratdarabimg724 - Great Northern Hopper Car 73629, undated
- Iratdarabimg725 - Great Northern Hopper Car 78005 at Eltopia, Washington, 1986
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