Population, resources, environment : issues in human ecology
1972
Ehrlich, Paul R. |
Ehrlich, Anne H. |
Ehrlich, Anne H.
Extinction : the causes and consequences of the disappearance of species
1982
Ehrlich, Paul R. |
Ehrlich, Anne H. |
The population explosion
1990
Ehrlich, Paul R. |
Ehrlich, Anne H. |