Trees of Western North America by Richard Spellenberg, Christopher J. Earle, Gil Nelson and Amy K. Hughes
English | 2014 | ISBN: 0691145792 , 0691145806 | 560 pages | PDF | 140 MB
Covering 630 species, more than any comparable field guide, Trees of Western North America is the most comprehensive, best illustrated, and easiest-to-use book of its kind.