Ecology and Natural Resource Management: Systems Analysis and Simulation William E. Grant, Ellen K. Pedersen, Sandra L. Marín ISBN: 978-0-471-13786-3 Hardcover 400 pages March 1997 US $180.00 Add to Cart This price is valid for United States. Change location to view local pricing and availability. This is a Print-on-Demand title. It will be printed specifically to fill your order. Please allow an additional 5-6 days delivery time. The book is not returnable.