The nature of crystals / by A. G. Ward, Preface by Prof. J. D. Bernal. Ward, A. G. (Alan Gordon), 1914-2007. Crystallography. QD905 .W3 541.2 WAN Includes bibliographical references and index. Bibliography: p. 106-107. London and Glasgow : Blackie, 1939. 1939. 1945 Text vii, 114 p.: eng Blackie's tracts on recent physics