00774nam0-22002651i-450-99000373073040332120101028112316.0000373073FED01000373073(Aleph)000373073FED0100037307320030910d1958----km-y0itay50------baengy-------001yyInvesting in economic knowledgeNational Beureau of economic researchU.S.A.The John B.Watkins Company1958108 p.26cmNational Bureau of Economic Research103307ITUNINARICAUNIMARCBK990003730730403321O3.591431DECTSDECTSInvesting in economic knowledge500988UNINA