00840nam0-22003011i-450 99000710046040332120180517115757.0000710046FED01000710046(Aleph)000710046FED0100071004620020701d1972----km-y0itay50------baengUSy-------001yyHuman resourcesfiftieth anniversary colloquium VINew YorkLondonColumbia University Press1972XX, 97 p.24 cmGeneral seriesNational Bureau of Economic Research96ITUNINARICAUNIMARCBK990007100460403321XV C 69 (96)94895FGBCI2.47DECTSDECTSFGBCHuman resources705479UNINA