illustrated keys for determining to species all butterflies found in North America, north of Mexico, with notes on their distribution, habits, and larval food, and suggestions for collecting and studying them Ehrlich, Paul R. creator text iau Dubuque, Iowa W. C. Brown Co. [1961] 1961 1st ed. monographic eng

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262 p. illus. 22 cm. by Paul R. Ehrlich and Anne H. Ehrlich. With sections contributed by D. L. Bauer [and others] 920403 n------ Butterflies North America Identification QL548 .E45 595.789 61002394 /L 730821 20160527185905.0 54789