National Audubon Society Field Guide to North American Birds．Eastern Region National Audubon Society Field Guide to North American Birds．Western Region National Audubon Society Field Guide to North American Wildflowers．Eastern Region National Audubon Society Field Guide to North American Birds National Audubon Society Field Guide to North American Butterflies National Audubon Society Field Guide to North American Wildflowers National Audubon Society Field Guide To North American Rocks and Minerals National Audubon Society Field Guide to North American Fishes,Whales,and Dolphins The Audubon Society Field Guide to North American Fossies