Agates by Pat McMahan is the culmination of 26 years of rock collecting. The best part is most of the agates presented in this book were field collected by the author. Agates the Pat McMahan collection, contains 1,250 of the finest and most rare agates in the world. The author has included some personal commentary, which makes for a interesting and sometimes funny reading experience. This book contains 496 pages with beautiful pictures making it a great gift for a rock hound. Some of the popular states the author collected at were: Arizona, California, and Oregon. In total the author has included agate specimans from 19 US states and 20 countries.