TY  - BOOK
AU  -  World Health organization 
TI  - Methods used in the user for establishing biologically  safe levels of toxic substances
SN  - 92 4 156043 6
U1  - QV600 
PY  - 0000///975
CY  - Geneva
PB  - W H O
KW  - Toxicology
N2  -  Toxicology
ER  -