00718nam0-22002771i-450-9900039486204033210-231-04616-2000394862FED01000394862(Aleph)000394862FED0100039486220030321d1979----km-y0itay50------bausaUSVariety,equity,<<and>> efficiencyColumbia universityNew York373 p.con grafici23 cmLancaster,Kelvin<1924-2001>56988ITUNINARICAUNIMARCBK990003948620403321D4.137906DECTSDECTSEfficiency513747UNINA