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100 1 $aSinger, S. Fred.$0(OLS)http://pug/name/120149
245 10$aIs there an optimum level of population? /$cS. Fred Singer.
260   $aNew York :$bMcGraw-Hill,$c[1971]
300   $a14, 426 p. :$bdiagr., prosp. ;$c23,5 cm
490 1 $apopulation Council
655 07$aDemografia$xDottrine e teorie demografiche.$0(OLS)http://pug/subject/29311
830  0$apopulation Council.$0(OLS)http://pug/title/139115
850   $aPUG
852   $aPUG$W1$xSeminario Scienze sociali$y8$mSoc. 764 E 24$j283215$n $b $q $B283215$CPUGBibl$Z2$F283215        $H73 582                        $82
941 1 $a20
996   $6084$a764 E$9(OLS)http://pug/classification/2546
996   $6245$aIs there an optimum level of population?$9(OLS)http://pug/title/139114