Pehlke, Robert D. Unit processes of extractive metallurgy/ Robert D. Pehlke - New York : American Elsevier Pub. Co. , c1973. - xiv, 396p. : ill., 25cm. Includes bibliographical references and index. ISBN: 0444001301 Subjects--Topical Terms: Metallurgy. Dewey Class. No.: 669 / P376