LEADER 00814nam0-22002651i-450 001 990002797390403321 005 20240105130451.0 035 $a000279739 035 $aFED01000279739 035 $a(Aleph)000279739FED01 100 $a20000920d1967----km-y0itay50------ba 101 0 $aeng 102 $aUS 200 1 $aProductivity differences within the servicesector.$fby Wilburn J. Fuchs V. 210 $aNew York$cNational Bureau of Economic Research$d1967. 215 $axiii, 109 p.$d23 cm 700 1$aWilburn,$bJean Alexander$0257025 702 1$aFuchs,$bVictor R.$f<1924- > 801 0$aIT$bUNINA$gRICA$2UNIMARC 901 $aBK 912 $a990002797390403321 952 $aC3-P18-05-RA$bs.i.$fECA 959 $aECA 996 $aProductivity differences within the servicesector$9422027 997 $aUNINA