Railroad Archives Online
- FondsD0153 - Doug Wingfield Collection
- Série003 - Great Northern Railway Company (U.S.)
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 002 - Diesel Locomotives
- PièceWingfield.57 - Great Northern Diesel Locomotive 311C, 313C, 276B at Floodwood, Minnesota, 1969
- PièceWingfield.58 - Great Northern Diesel Locomotive 311C, 313C, 276B at Floodwood, Minnesota, 1969
- PièceWingfield.59 - Great Northern Diesel Locomotive 312A, 312B, 576 at Floodwood, Minnesota, 1969
- PièceWingfield.60 - Great Northern Diesel Locomotive 312A, 312B, 576 at Floodwood, Minnesota, 1969
- PièceWingfield.61 - Great Northern Diesel Locomotive 446A at Vancouver, British Columbia, 1969
- 34 en plus...