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200 1 $aRecreation economic decisions$ecomparing benefits and costs$fRichard G. Walsh
210   $aState College [Pennsylvania]$cVenturePubl. Inc.$d1986
215   $aXIV, 635 p., 23 cm
700  1$aWalsh,$bRichard G.$0146357
801  0$aIT$bUNINA$gRICA$2UNIMARC
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