Railroad Archives Online
- FondoD0153 - Doug Wingfield Collection
- Serie001 - Burlington Northern Railroad Company
- Subserie014 - Photographs
- 003 - Railroads--Buildings and Structures
- 010 - Miscellaneous Structures
- Unidad documental simpleWingfield.111 - Libby Dam, Montana, 1970
- Unidad documental simpleWingfield.112 - Libby Dam, Montana, 1970
- Unidad documental simpleWingfield.113 - Libby Dam, Montana, 1970
- Unidad documental simpleWingfield.114 - Libby Dam, Montana, 1970
- Unidad documental simpleWingfield.115 - Libby Dam, Montana, 1970
- Unidad documental simpleWingfield.116 - Libby Dam, Montana, 1970
- Unidad documental simpleWingfield.117 - Libby Dam, Montana, 1970
- 4 más...