Metamorphism : a study of the transformations of rock-masses / Alfred Harker. Harker, Alfred, 1859-1939. Tilley, Cecil Edgar, 1894- [from old catalog] ed. Metamorphic rocks. QE475 .H3 1939 551 HAM Includes bibliographical references and index. London : Methuen & co. ltd., 1950. 1950. 1939 Text ix, 362 p. : eng