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*24510$aFarm records$cJohn A. Hopkins and Earl O. Heady
*250  $a3rd ed.
*260  $aAmes$bIowa State College Press$c1949
*300  $aXIII,303 s.$bill.
*7001 $aHeady, Earl O.$0(NO-TrBIB)90544755$_37251500
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