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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- Iratdarabimg608 - Great Northern Boxcar 138296 at Albuquerque, New Mexico, 1980
- Iratdarabimg609 - Great Northern Boxcar 138304 at Pasco, Washington, 1983
- Iratdarabimg610 - Great Northern Boxcar 138320 at Tucumcari, New Mexico, 1987
- Iratdarabimg611 - Great Northern Boxcar 138385 at Albuquerque, New Mexico, 1980
- Iratdarabimg612 - Great Northern Boxcar 138724 at Broomfield, Colorado, 1990
- Iratdarabimg613 - Great Northern Boxcar 138724 at Amarillo, Texas, 1994
- Iratdarabimg614 - Great Northern Boxcar 138827 at Amarillo, Texas, 1992
- Iratdarabimg615 - Great Northern Boxcar 138827 at Amarillo, Texas, 1996
- Iratdarabimg616 - Great Northern Boxcar 138833 at Albuquerque, New Mexico, 1980
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