Out of print. New edition ISBN-13: 978-1947556058 Out of print. New edition ISBN-13: 978-1947556058 Out of print. New edition ISBN-13: 978-1947556058 Out of print. New edition ISBN-13: 978-1947556058 Since 1991,  Sterling Test Prep  prepares students for academic success. Sterling Test Prep  publishes  more than 140 study aids  for high school, undergraduate, graduate, and professional students. Our writers, contributors, and editors are highly educated in sciences and humanities, with extensive classroom teaching and research experience. They are experts on preparing students for standardized tests, as well as undergraduate and graduate admissions coaching. Sterling Test Prep  supports environmental organizations committed to conservation, research, and preservation of vital natural resources. Your purchase helps  support global environmental organizations  so they can continue their critical missions.