TY  - BOOK
AU  -  World Health Organization 
TI  - Determination of airborne fibre number concentrations: a recommended method ,by phase contrast optical  microscopy (membrane filter method)
SN  - 92 4 154496 1
U1  - WA450 
PY  - 1997///
CY  - Geneva
PB  - W H O
KW  - Environmental Monitoring
KW  - Microscopy
KW  - Air Polluants,Occupational
N2  -  Air Polluants,Occupational, Microscopy, Environmental Monitoring
ER  -