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 3002 - Diesel Locomotives
- 13 more...
- Itemimg119 - Great Northern Diesel Locomotive 3021 at Havre, Montana, 1969
- Itemimg12 - Great Northern Diesel Locomotive 139 at Saint Paul, Minnesota, 1971
- Itemimg120 - Great Northern Diesel Locomotive 3033 at Whitefish, Montana, 1969
- Itemimg121 - Great Northern Diesel Locomotive 3034 at Denver, Colorado, 3/17/1970
- Itemimg122 - Great Northern Diesel Locomotive 3034 at Denver, Colorado, 1970
- Itemimg123 - Great Northern Diesel Locomotive 3034 at Denver, Colorado, 1970
- Itemimg124 - Great Northern Diesel Locomotive 1 at Spokane, Washington, 1962
- Itemimg125 - Great Northern Diesel Locomotive 10 at Spokane, Washington, 1962
- Itemimg126 - Great Northern Diesel Locomotive 27 at Minneapolis, Minnesota, 1965
- 206 more...