003450000a2200121000450024500730000065000250007365000250009865000240012304100130014770000180016010000180017877300270019610aOceans and security: background paper 4: defence and research issues14aPolítica ambiental14aEcosistemas costeros14aSeguridad ambiental0 aInglés1 aEdson, Robert1 aGaffney, Paul1 tPreprint33q1-9d1997