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*24500$aConservation of natural resources$ced.: Guy-Harold Smith ; contributors: Robert M. Basile ... [et al.]
*250  $a4th ed.
*260  $aNew York$bJohn Wiley$c1971
*300  $a685 s.$bill.
*650 7$aEnvironmental protection$2agrovoc$_185525600
*650 7$aNatural resources management$2agrovoc$_187959500
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*7001 $aSmith, Guy-Harold$0(NO-TrBIB)4006672$_45175000
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