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100   $a20000920d1990----km-y0itay50------ba
101 0 $aita
102   $aIT
200 1 $aNatural Resource Economics$eConservation and Exploitation$fPhilip A. Neher.
210   $aCambridge$cCambridge University Press$d1990.
215   $aIX, 360 p.$d22 cm
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