A field guide to trees and shrubs; field marks of all trees, shrubs, and woody vines that grow wild in the northeastern and north-central United States and in southeastern and south-central Canada - Petrides, George A. (Boston, Houghton Mifflin, 1972)
Keywords: Trees -- United States -- Identification; Shrubs -- United States -- Identification; Trees -- Canada -- Identification; Shrubs -- Canada -- Identification; Climbing plants -- United States -- Identification; Climbing plants -- Canada -- Identification