Modern Arboriculture: A Systems Approach to the Care of Trees and Their Associates: Alex L. Shigo: 9780943563091: Amazon.com: Books
A New Tree Biology: Facts, Photos and Philosophies on Trees: Alex L. Shigo: 9780943563046: Amazon.com: Books
Tree Pruning: A Worldwide Photo Guide by Alex L. Shigo http://www.amazon.com/dp/0943563089/ref=cm_sw_r_pi_dp_FNK7ub0X7F09E
100 Tree Myths by Alex Shigo, the man that took down our fallen tree recommended this book & Mr Shigo highly. Also the Boy Scouts for studying trees.
BOOK111 - Modern Arboriculture, Touch Trees - A. Shigo
Tree Anatomy by Alex Shigo
Tree Basics: What Every Person Needs to Know About Trees by Alex L. Shigo - $24
Webelos Forester #1 The Encyclopedia of Forestry- Forest Types of North America
National Audubon Society Field Guide to North American Trees: Eastern Region
An Illustrated Guide to Pruning by Edward F. Gilman http://www.amazon.com/dp/111130730X/ref=cm_sw_r_pi_dp_liQCwb193HDSN
Native Trees, Shrubs, and Vines: A Guide to Using, Growing, and Propagating North American Woody Plants by William Cullina
Tree Finder: A Manual for Identification of Trees by their Leaves (Eastern US) (Nature Study Guides) by May Theilgaard Watts,http://www.amazon.com/dp/0912550015/ref=cm_sw_r_pi_dp_jRoXsb0ME0KT93J4
Reading the Forested Landscape: A Natural History of New England by Tom Wessels http://www.amazon.com/dp/0881504203/ref=cm_sw_r_pi_dp_MIpyub0FH79R1
The Reference Manual of Woody Plant Propagation: From Seed to Tissue Culture
Bark : a field guide to trees of the northeast / Michael Wojtech.
"Provides descriptions and annotated photographs of various species of trees, including conifers, broadleaves, and palms, and includes height, shape, leaf persistence, and leaf type indicators."