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*1001 $aFogel, Robert William$0(NO-TrBIB)90157843$_26300900
*24510$aChanges in the process of aging during the twentieth century :$bfindings and procedures of the early indicators project$cRobert W. Fogel
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
*300  $a49 s.$bill.
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