TY  - BOOK
AU  - Thomas,William A.
ED  - American Association for the Advancement of Science.
TI  - Indicators of environmental quality
T2  - Environmental science research
SN  - 0306363011
U1  - 628.5 
PY  - 1972///
CY  - New York
PB  - Plenum Press, 
KW  - CALIDAD AMBIENTAL
KW  - CONTAMINACION DEL AIRE
N1  - Proceedings of a symposium held during the AAAS meeting in Philadelphia, Pennsylvania, December 26-31, 1971; Incluye referencias bibliográficas e índice
ER  -