Volume 30 (1981): Issue 3 (May 1981)

Book Review
Freshwater Snails of Africa and Their Medical Importance
by David S. Brown. 487 pages, illustrated. Taylor and Francis Ltd., London. Distributed in the Americas by American Malacologists, Inc., P.O. Box 2255, Melbourne, Florida 32901. 1980. $55.00
Book Review
Scorpions of Medical Importance
by Hugh L. Keegan. ix + 140 pages, illustrated. University Press of Mississippi, 3825 Ridgewood Road, Jackson, Mississippi 39211. 1980. $22.50
Book Review
Principles of Genetic Toxicology
by D. Brusick. xix + 279 pages, illustrated. Plenum Publishing Corporation, 227 West 17th Street, New York, New York 10011. 1980. $25.00
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