TY  - BOOK
ED  - Tennessee Valley Authority
ED  - Air & Waste Management Association
ED  - Environmental Protection Agency
TI  - Environmental resource guide : : air quality : a series of classroom activities for GRADES 6-8 / 
U1  - 363.7392 
PY  - 1991///
CY  - Pittsburgh, PA : 
PB  - Education Program Manager, Air & Waste Management Association, 
KW  - Ar
KW  - Controle de qualidade
KW  - Poluição
ER  -