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200 1 $aSociety and Population$fDavid M. Heer.
210   $aEnglewood Cliffs$dN.J.$cPrentice-Hall$d1968.
215   $aix, 118 p.$d24 cm
225 1 $aFoundations of Modern Sociology Series
610 0 $aDemografia
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702  1$aHeer,$bDavid M.
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