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200 1 $a<<The >>theory of trade and protection$fWilliam Penfield Travis
210   $aCambridge, Massachusetts$cHarvard University Press$d1964
215   $ax, 295 p.$d21 cm
225 1 $aHarvard economic studies$vCXXI
700  1$aTravis,$bWilliam Penfield$0133295
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