Railroad Archives Online
- FondoD0036 - George Werkema Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 003 - Freight Cars
- 198 in più...
- Unità documentariaimg613 - Great Northern Boxcar 138724 at Amarillo, Texas, 1994
- Unità documentariaimg614 - Great Northern Boxcar 138827 at Amarillo, Texas, 1992
- Unità documentariaimg615 - Great Northern Boxcar 138827 at Amarillo, Texas, 1996
- Unità documentariaimg616 - Great Northern Boxcar 138833 at Albuquerque, New Mexico, 1980
- Unità documentariaimg617 - Great Northern Boxcar 138923 at Albuquerque, New Mexico, 1980
- Unità documentariaimg618 - Great Northern Boxcar 138961 at Albuquerque, New Mexico, 1978
- Unità documentariaimg619 - Great Northern Boxcar 138997 at Pasco, Washington, 1990
- Unità documentariaimg620 - Great Northern Boxcar 319107 at Bellingham, Washington, 1993
- Unità documentariaimg621 - Great Northern Boxcar 319140 at Idaho Falls, Idaho, 1991
- 312 in più...