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100   $a20030910d1961----km-y0itay50------ba
101 0 $aeng
102   $aUS
200 1 $aAgricultural production functions$fEarl O. Heady, John L. Dillon
210   $aAmes, Iowa$cIowa State University Press$d1961
215   $aviii, 667 p.$cill.$d24 cm
610 0 $aProduzione agricola$aFunzioni
700  1$aHeady,$bEarl Orel$f<1916- >$079005
701  1$aDillon,$bJohn L.$0358882
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