"Peterson's Field Guide to Venomous Animals & Poisonous Plants", Steven Foster and Roger Caras, Houghton Mifflin Co., 1994, ISBN 0-395-93608-X (pbk) An excellent field guide to identifying poisonous plants and animals.
"Peterson's Field Guide to Trees and Shrubs", George A. Petrides, Houghton Mifflin Co, 1972, ISBN 0-395-35370-X (pbk), A field guide to identifying trees and shrubs.
"Peterson's Field Guide to Mammals", William H Burt and Richard P. Grossenheider, Houghton Mifflin Co, 1976, ISBM 0-395-91098-6 (PBK) A field guide to identifying mammals.
"Peterson's Field Guide to Reptiles and Amphibians", Roger Conant and Joseph T. Collins, Houghton Mifflin Co., 1998, ISBN 0-395-90452-8 A field guide to identifying reptiles and amphibians.
"Berry Finder", Dorcas S. Miller, Nature Study Guild, 1986 A pocket guide to native plants with fleshy fruits
"Track Finder", Dorcas S. Miller, Nature Study Guild, 1981 A pocket guide to mammal tracks of eastern North America
"Fern Finder", Anne C Hallowell and Barbara G Hallowell, Nature Study Guild, 1981 A pocket guide to native ferns of northeastern and central North America
"Tree Finder", Nature Study Guild
"Winter Tree Finder", Nature Study Guild
"Fossils", Cyril Walker and David Ward, Dorling Kindersley, Inc, 1992, ISBN 1-56458-074-1 Excellent field book on fossil identification with color illustrations
"Familiar Animal Tracks of North America", John Farrand, Jr, National Audubon Society, 1993, ISBN 0-679-74148-8 Excellent field book on track identification'
"Tom Brown's Field Guide to Nature Observation and Tracking", Tom Brown and Brandt Morgan, Berkley Publishing Co., 1983, ISBN 0-425-06177-9 Definitive guide to tracking and track identification
"Fall Color Finder", C Ritchie Ball and Anne H. Lindsey, Laurel Hill Press, 1993, ISBN 0-9608688-2-8 A pocket guide to identifying trees from their leaves and fall colors
"Flower Finder", May Theilgaard Watts, Nature Study Guide, 1955 A pocket guide to identification of spring wild flower and flower families
"Mammal Finder", Ron Russo and Pam Olhausen, Nature Study Guild, 1987, ISB 0-912550-16-3 A pocket guide to mammals of the Pacific coast states, their tracks, skulls and other signs