Shigo, Alex L., A new tree biology : facts, photos, and philosophies on trees and their problems and proper care / - 2nd ed. - Durham, N.H. : Shigo and Trees, 1989. - xiv, 618 p. : ill. ; 24 cm. Includes index. ISBN: 0943563046 : Subjects--Topical Terms: Trees.Trees, Care of. Dewey Class. No.: 635 SHI 1989 A041 Or.