00814nam0-22002651i-450 99000279739040332120240105130451.0000279739FED01000279739(Aleph)000279739FED0120000920d1967----km-y0itay50------baengUSProductivity differences within the servicesector.by Wilburn J. Fuchs V.New YorkNational Bureau of Economic Research1967.xiii, 109 p.23 cmWilburn,Jean Alexander257025Fuchs,Victor R.<1924- >ITUNINARICAUNIMARCBK990002797390403321C3-P18-05-RAs.i.ECAECAProductivity differences within the servicesector422027UNINA