TY  - BOOK
AU  - 
TI  - El desafÃ­o ecolÃ³gico
T2  - ColecciÃ³n guidance
SN  - 8471031531
AV  - QH541 .A533 1982
PY  - 1982///
CY  - Buenos Aires
PB  - Hvmanitas
KW  - Ecology
KW  - Pollution
KW  - Environmental aspects
KW  - Local
N1  - Includes bibliographical references
ER  -