Railroad Archives Online
- CollectionD0153 - Doug Wingfield Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3008 - Buses
- ItemWingfield.50 - Great Northern Bus 103 at Whitefish, Montana, 1971