Koopmans, Tjalling C. Three essays on the state of economic science / Tjalling C. Koopmans - Paperback ed. - New York : McGraw-Hill , 1957 - xi, 231p. : ill. ; 23 cm. Includes bibliographical references and index. ISBN: 0070353352 Subjects--Topical Terms: Economics Dewey Class. No.: 330.4 / KOO