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*1001 $aLichtenberg, Frank R$0(NO-TrBIB)90611297$_30447400
*24510$aSources of U.S. longevity increase, 1960-1997$cFrank R. Lichtenberg
*260  $aCambridge, Mass.$bNBER$c2002
*300  $a18, [14] s.
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