00000cam a22000004a 4500 UP-1685523046125179788 Buklod 20230503092606.0 m o j ta 991231s1960 xx r |||| u|eng|| (iLib)UPMNL-00000029689 HC106.5 S44 Silk, Leonard Solomon 1918-. The research revolution Leonard Solomon Silk ; with an introduction by Wassily W. Leontief ; illustrations by John Groth. New York McGraw-Hill 1960 244 p. ill. Research, Industrial United States. United States Economic conditions 1945- CPH-6321 CPH-6320 UPMNL CPH HC106.5 S44 Book