Riddles on the Rocks: A Tour of Selected North American Rock Art Sites

Leon Yost is a professional photographer who has worked as a location scout for the BBC and is published in Time-Life Books, American Photo, The New York Times and many other publications. He has documented Native American rock art with his painter-wife Erma Martin Yost since 1976. Other books by Leon Yost: Changing Jersey City, a history in photographs, co-author with Cynthia Harris, 2009; A Tour of Australian Rock Art, 2017