TY  - BOOK
AU  - Purdom P Walton
TI  - Environmental health
AV  - WA30  
U1  - 614.7 
PY  - 1971///
CY  - New York
PB  - Academic Press
KW  - Environmental health
N1  - Includes bibliographies and index
UR  - http://www.loc.gov/catdir/toc/els031/79051692.html
ER  -