Peggy Pickering LarsonWilliam Ascarza is the author of the Arcadia publication Tucson Mountains and is also the author of Zenith on the Horizon: An Encyclopedic Look at the Tucson Mountains from A to Z. Peggy Larson is the archivist for the Arizona-Sonora Desert Museum an author of Arizona-Sonora Desert Museum: A Scrapbook, Deserts of America, and coauthor with Lane Larson of Deserts of the Southwest. Read More Read Less