Animal life in fresh water : a guide to fresh-water invertebrates / by Helen Mellanby ; with a foreword by L. E. S. Eastham. Mellanby, Helen. Freshwater animals. QL141 .M4 1975 592 MEA Distributed in the U.S.A. by Halsted Press, a division of J. Wiley, New York. Includes bibliographies and index. London : Chapman and Hall, c1975. c1975. 1975 Text xi, 308 p. : eng Science paperbacks ; 120