00347nam a2200121 a 450000500170000002000150001708200130003210000200004524500430006526000360010830000150014449000660015920251203090514.0  a0709914636  a577bJON  aJones, Gareth E  aConservation of ecosystems and species  aLoNew DelhionbGroom Helmc1987  a278p, 22cm  aCroom Helm natural environment Problems and management series