Railroad Archives Online
- FondD0153 - Doug Wingfield Collection
- Sorozat001 - Burlington Northern Railroad Company
- Alsorozat014 - Photographs
- 003 - Railroads--Buildings and Structures
- 010 - Miscellaneous Structures
- IratdarabWingfield.111 - Libby Dam, Montana, 1970
- IratdarabWingfield.112 - Libby Dam, Montana, 1970
- IratdarabWingfield.113 - Libby Dam, Montana, 1970
- IratdarabWingfield.114 - Libby Dam, Montana, 1970
- IratdarabWingfield.115 - Libby Dam, Montana, 1970
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