@book{ BB1211801X, author = "Opler, Paul A. and Malikul, Vichai and National Audubon Society and National Wildlife Federation and Roger Tory Peterson Institute", title = "A field guide to eastern butterflies", publisher = "Houghton Mifflin", year = "1992", series = "The Peterson field guide series", number = "4", URL = "https://ci.nii.ac.jp/ncid/BB1211801X" }

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