Kahn, Sandra, Ehrlich, Paul R. (2) Ehrlich, Paul R. (2) Ehrlich, Paul R. (bing Professor Of Populations Studies Emeritus, Ceballos, Gerardo (instituto De Ecologia, Dirzo, Rodolfo (stanford University) (1) Kölmel, Hans Wolfgang (1) Ornstein, Robert, Ehrlich, Paul R (1)