Vertebrate reproductive cycles / William Sydney Bullough. Bullough, William Sydney, 1914- Reproduction. QP251 .B76 1961 596 BUV First published in 1951 under title: Vertebrate sexual cycles. Includes bibliographical references and index. London : Methuen, New York : Wiley, 1961 1961 1961 Text viii,123p. : eng Methuen's monographs on biological subjects