&i;Volume 1: Conifers. Volume 2: Hardwoods&o;. Describes the silvical characteristics of about 200 forest tree species and varieties. Information on habitat, life history, and genetics is given for 15 genera, 63 species, and 20 varieties of conifers and for 58 genera, 128 species, and 6 varieties of hardwoods. These represent most of the commercially important trees of the United States and Canada and some of those important from Mexico and the Carribean Islands, making this a reference for virtually all of North America.