

Virginia Clark
Virginia Clark was a pseudonym used by Patsey Gray, about whom you can find more information here.
Finding the book : The book is not hugely common, and pricing is variable.
Sources and links:
Terri A. Wear: Horse Stories, an Annotated Bibilography, Scarecrow Press, 1987
Bibliography -
The Mysterious Buckskin
Macmillan, New York, 1960, 164 pp
“When Ann and Ken lead a group of three dudes and their horses on a long trail ride,
Ann thinks that their buckskin
horse looks just like her Frosty that was stolen a
couple of years earlier, that Ken himself was accused of stealing.”