00864nam0-22002531i-450-99000364021040332120101028115329.0000364021FED01000364021(Aleph)000364021FED0100036402120030910d1962----km-y0itay50------baengy-------001yy<<The >>rate and direction of Inventive activity economic and Social Change in developed countriesNational bureau of Economic ResearchPrinceton[s.n.]1962National Bureau of Economic Research103307ITUNINARICAUNIMARCBK990003640210403321SE 049.03.010-032562DECSEDECSERate and direction of Inventive activity economic and Social Change in developed countries504369UNINA