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200 1 $aDemography through problems$fNathan Keyfitz, John A. Beekman
210   $aNew York$cSpringer Verlag$dc1984
215   $aVIII, 141 p.$d24 cm
225 2 $aProblem books in mathematics
410  1$12001$aProblem books in mathematics
606 0 $aDemografia$2BNCF
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701  1$aBEEKMAN,$bJohn A.$0103653
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