More than 160 carriages and wagons populate the Cheyenne Frontier Days Old West Museum in Wyoming, and they are kept looking good and running smoothly by a group of volunteers called the Wagon Doctors. Documenting the history of these vehicles is the job of 83-year-old Marietta Dinneen, who grew up on a Wyoming ranch that was a stop along a stagecoach trail long before she was born.

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