By Ronald M. Lanner (Author) The pinon pines are a group of small, hardy trees that inhabit the semi-arid mountains and mesas of the Western United States and Mexico. Because they produce exceptionally nutritious pine nuts and grow where few other trees can survive, they have a long relationship with man and animal in the pinon-juniper woodland. ISBN-10: 0874170664 ISBN-13: 978-0874170665