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Book Description Hardcover. Condition: New. viii + 216 p, 395 figs., 6 halftones, with a Preface to the reprint edition by Dr. George F. Edmunds, Jr. Treats 48 genera and 22 species, with Illinois records of 126 species (15 of which are described as new). Still an indispensable reference for identification of mayflies of the Midwest. Originally published in 1953 as Bull. Illinois Natural History Survey, Vol. 26, Art. 1. Facsimile reprint on acid free paper. Seller Inventory # 1278