Butterflies of Pennsylvania, a field guide By James L. Monroe, David M. Wright University of Pittsburgh Press ISBN: 9780822964551 Cite: 2117542 with citation markup [cite:2117542]
From the publishers page:
https://upittpress.org/books/9780822964551/
This work has all of the features that make field guides to a region's butterfly fauna useful to anyone with a serious interest in that fauna. . . . the book is a bargain and a must for anyone with an interest not just in Pennsylvania's fauna, but the northeast fauna as a whole.
News of the Lepidopterists' Society
Winner, 2017 National Outdoor Book Award
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Though I am in the southeast, I own this field guide and find it very useful - Roy Cohutta Brown.
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