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101 0 $aeng
102   $aUS
105   $aa-------001yy
200 1 $aDemography trough problems$fN. Keyfitz, J. A. Beekman
210   $aNew York$cSpringer-Verlag$dc1984
215   $avi, 141 p.$d24 cm
225 1 $aProblem Books in Mathematics
610 0 $aDemografia$aEsercizi
610 0 $aMatematica$aSociologia$aEsercizi
676   $a304.6$v21$zita
700  1$aKeyfitz,$bNathan$0104369
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996   $aDemography trough problems$9381067
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