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