This edition has been revised and completely updated to offer readers current information available in the field. Now including both English and SI units, the book features updated coverage of non-timber forest resources, as well as increased coverage of statistical methods and sampling. The chapter on "Site, Stocking and Stand Density" has been greatly expanded. The book includes material on assessing range-land, wildlife, water and recreational resources. A comprehensive chapter on sampling designs is included to set the stage for chapters on timber inventories based on sample strips or plots, point samples or 3P sampling. A chapter dealing with the state-of-the-art techniques in the use of aerial photographs is designed to serve as an introduction for readers with a limited background on this inventory tool.