Heckman, Charles W Encyclopedia of South American aquatic insects. Ephemeroptera : illustrated keys to known families, genera, and species in south America by Charles W. Heckman - Dordrecht ; Boston Kluwer Academic Publishers 2002 - 419 p. : ill., maps ; 25 cm Includes bibliographical references and index ISBN: 9781402007750 Subjects--Topical Terms: Mayflies -- South America -- Identification Dewey Class. No.: 595.7176098 HEC