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A Field Guide to Western Butterflies
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Paul A. Opler
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The Very Hungry Caterpillar
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Eric Carle
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The Audubon Society Handbook for Butterfly Watchers
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Robert Michael Pyle
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The Butterflies of North America
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James A. Scott
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Butterflies Through Binoculars
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Jeffrey Glassberg
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Handbook for Butterfly Watchers
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Robert Michael Pyle, Roger Tory Peterson Institute
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A Field Guide to Eastern Butterflies
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Paul A. Opler
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Butterflies Through Binoculars
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Jeffrey Glassberg, Marc C. Minno, John V. Calhoun
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The Life Cycle of a Butterfly
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Bobbie Kalman
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California Butterflies
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John S. Garth, John Shrader Garth, James Wilson Tilden
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