Railroad Archives Online
- CollectionD0153 - Doug Wingfield Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3003 - Maintenance Facilities
- ItemWingfield.141 - Great Northern Turntable at Great Falls, Montana, 1971
- ItemWingfield.142 - Great Northern Turntable at Great Falls, Montana, 1971
- ItemWingfield.217 - Northern Pacific Roundhouse at Missoula, Montana, 1971
- ItemWingfield.218 - Northern Pacific Roundhouse at Missoula, Montana, 1971
- ItemWingfield.219 - Northern Pacific Roundhouse at Missoula, Montana, 1971