00783nam0-22003011i-450-99000329019040332120001010000329019FED01000329019(Aleph)000329019FED0100032901920000920d1958----km-y0itay50------baitay-------001yyCONSERVATION OF NATURAL RESOURCESNew YorkWiley & Sons1958pp. 450Risorse Naturali050.011Smith,Guy-Harold271262ITUNINARICAUNIMARCBK990003290190403321050.011.SMI019479DECGEDECGECONSERVATION OF NATURAL RESOURCES445544UNINAING01