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101 0 $aeng
102   $aUS
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200 1 $aAmerican agriculture in the twentieth century$ehow it flourished and what it cost$fBruce L. Gardner
210   $aCambridge, Mass$cHarvad university press$d2002
215   $aX, 388 p.$cill.$d23 cm
610 0 $aEconomia agraria
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700  1$aGardner,$bBruce L.$089675
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