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200 1 $aTrade and Economic Structure$emodels and methods$fRichard E. Caves.
210   $aCambridge,Massachusetts$cHarvard University Press ,$d1960
215   $aVIII,, 317 p.$d24 cm
225 1 $aHarvard economic studies$v115
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700  1$aCaves,$bRichard E.$0418
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