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200 1 $aPopulation Resources Environment$fPaul R. Ehrlich, Anne H. Ehrlich
210   $aSan Francisco$cW.H. Freeman and Company$dc1970
215   $a383 p.$d32 cm
225 1 $a<<A >>Series of Books in Biology
610   $aAmbiente delle risorse della popolazione
676   $a304.2$v22$zita
700  1$aEhrlich,$bPaul R.$063723
702  1$aEhrlich,$bAnne H.
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