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) Ehrlich, Paul, Dobkin, David, Wheye, Darryl (1) Ehrlich, Paul R., Sagan, Carl, Kennedy, Donald, Roberts, Walter Orr (1)