Koopmans, Tjalling C. Three essays on the state of economic science / Tjalling C. Koopmans - New York : McGraw-Hill, c1957. - xi, 231 p. ; 24 cm. ISBN: LCCN: Subjects--Topical Terms: Economics LC Class. No.: HB171 / .K69 1957 Dewey Class. No.: 330.4 / K82t