LEADER 00797nam0-22002651i-450- 001 990003731430403321 005 20101028115014.0 035 $a000373143 035 $aFED01000373143 035 $a(Aleph)000373143FED01 035 $a000373143 100 $a20030910d1962----km-y0itay50------ba 101 0 $aeng 105 $ay-------001yy 200 1 $a<>rate and direction of inventive activity$eEconomic and social factors$fN.B.E.R. 210 $aUSA$cPrinceton University Press$d1962 215 $a635 p.$d23cm 710 02$aNational Bureau of Economic Research$0103307 801 0$aIT$bUNINA$gRICA$2UNIMARC 901 $aBK 912 $a990003731430403321 952 $aO3.61$b3218$fDECTS 959 $aDECTS 996 $aRate and direction of inventive activity$9501034 997 $aUNINA