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
- 291 more...
- Itemimg720 - Great Northern Hopper Car 73105 at Longmont, Colorado, 1974
- Itemimg721 - Great Northern Hopper Car 73272, undated
- Itemimg722 - Great Northern Hopper Car 73303, undated
- Itemimg723 - Great Northern Hopper Car 73612 at Denver, Colorado, 1976
- Itemimg724 - Great Northern Hopper Car 73629, undated
- Itemimg725 - Great Northern Hopper Car 78005 at Eltopia, Washington, 1986
- Itemimg726 - Great Northern Hopper Car 78015 at Broomfield, Colorado, 1989
- Itemimg727 - Great Northern Hopper Car 78018 at Denver, Colorado, 1989
- Itemimg728 - Great Northern Hopper Car 78034 at Denver, Colorado, 1982
- 219 more...