004620000a2200145000450024501020000065000240010265000190012665000240014565100190016904100130018870000230020170000220022410000220024677300480026810aWhat exactly is an endangered species? an analysis of the U.S. endangered species list: 1985-199114aEspecies en peligro14aConservación14aCostos económicos 4pEstados Unidos0 aInglés1 aMcMillan, Margaret1 aWinston, Keith C.1 aWilcove, David S.1 tConservation Biology324h1q87-93d1993g7