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 3001 - Steam Locomotives
- ItemWingfield.4 - Great Northern Steam Locomotive 822 at Superior, Wisconsin, 1961
- ItemWingfield.5 - Great Northern Steam Locomotive 2101 at Superior, Wisconsin, 1961
- ItemWingfield.6 - Great Northern Steam Locomotive 2023 at Superior, Wisconsin, 1961
- ItemWingfield.7 - Great Northern Steam Locomotive 2040 at Superior, Wisconsin, 1961
- ItemWingfield.8 - Great Northern Steam Locomotive 2043 at Superior, Wisconsin, 1961
- ItemWingfield.9 - Great Northern Steam Locomotive 2554 at Superior, Wisconsin, 1961
- ItemWingfield.10 - Great Northern Steam Locomotive 2554 at Superior, Wisconsin, 1961