Butterflies Of Illinois A Field Guide
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This book "offers a portable easy-to-use guide rich with descriptions, field photography, and life-sized specimen photos of all the state's native species". Michael R. Jeffords is the retired education/outreach director for the Illinois Natural History Survey (INHS). Susan L. Post is a retired INHS field biologist and James R. Wiker is a research associate of the Illinois State Museum and an affilitate of the INHS.