Chemistry and methods of enzymes / James B. Sumner and G. Fred Somers. Sumner, James B. (James Batcheller), 1887-1955. Somers, G. Fred (George Fredrick), 1914-2000. Enzymes. QP601 .S88 1947 574.19 SUC Includes bibliographical references and index. New York, N.Y. : Academic Press, 1947. 1947. 1947 Text xi, 415 p. : eng