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Paul A. Opler

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Butterflies of the West
Handbook to North American Butterflies: East and Midwest
Peterson First Guide to Butterflies and Moths
The Complete Book of North American Butterflies
Biology, Ecology, and Host Specificity of Microlepidoptera Associated with Quercus Agrifolia (Fagaceae)
Peterson First Guide to Butterflies and Moths
A Field Guide to Western Butterflies
A field guide to eastern butterflies
Moths of Western North America
A Field Guide to Western Butterflies (Peterson Field Guides(R))
Biology, Ecology, and Host Specificity of Microlepidoptera Associated with Quercus Agrifolia (Fagaceae).
A Field Guide to Eastern Butterflies (Peterson Field Guides)
Field Guide To Western Butterflies
Butterflies
Audubon Society's Butterflies for Beginners

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