TY  - BOOK
AU  - Friis, Robert H.
TI  - Essentials of Environmental Health 
SN  - 9780763778903
U1  - 616.98 
PY  - 2012///
CY  - Sudbury, Ma : 
PB  - Jones and Bartlett Learning, 
KW  - Environmental Health
KW  - Environmental Pollution
N1  - YY
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/978-0-7637-7890-3.pdf
ER  -