TY  - BOOK
AU  - Ward,Barbara
AU  - Strong,Maurice F.
TI  - Quién defiende la tierra?
U1  - 301.31 
PY  - 1975///
CY  - México
PB  - Fondo de Cultura Económica
KW  - Human ecology
KW  - Addresses, essays, lectures
KW  - Local
KW  - Pollution
KW  - Population
N1  - Translation of : Who speaks for earth
ER  -