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
- 14 more...
- ItemWingfield.73 - Great Northern Diesel Locomotive 721 at Oroville, Washington, 1968
- ItemWingfield.75 - Great Northern Diesel Locomotive 3000 at Sandpoint, Idaho, 1968
- ItemWingfield.76 - Great Northern Diesel Locomotive 3000, 3014 at Sandpoint, Idaho, 1968
- ItemWingfield.77 - Great Northern Diesel Locomotive 3004, 3012, 3013 at Sandpoint, Idaho, 1968
- ItemWingfield.78 - Great Northern Diesel Locomotive 3006 at Spokane, Washington, 1968
- ItemWingfield.79 - Great Northern Diesel Locomotive 3006, 3011, 3019 at Sandpoint, Idaho, 1968
- ItemWingfield.82 - Great Northern Diesel Locomotive 180 at Spokane, Washington, 1968
- ItemWingfield.83 - Great Northern Diesel Locomotive 180 at Spokane, Washington, 1968
- ItemWingfield.84 - Great Northern Diesel Locomotive 180 at Spokane, Washington, 1968
- 16 more...