TY  - BOOK
AU  - The Open University.
TI  - Introduction Unit1- 2: environmental control and public health
T2  - Technology:a second level course
PY  - 1992///
CY  - London 
PB  - The Open Univesty
KW  - Polluction
KW  - environmental control
KW  - Biology
N1  - Includes bibliogrphical references
ER  -