Railroad Archives Online
- CollectionD0153 - Doug Wingfield Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- ItemWingfield.57 - Great Northern Diesel Locomotive 311C, 313C, 276B at Floodwood, Minnesota, 1969
- ItemWingfield.58 - Great Northern Diesel Locomotive 311C, 313C, 276B at Floodwood, Minnesota, 1969
- ItemWingfield.59 - Great Northern Diesel Locomotive 312A, 312B, 576 at Floodwood, Minnesota, 1969
- ItemWingfield.60 - Great Northern Diesel Locomotive 312A, 312B, 576 at Floodwood, Minnesota, 1969
- ItemWingfield.61 - Great Northern Diesel Locomotive 446A at Vancouver, British Columbia, 1969
- 34 more...