WORLD Health Organization <br/><br/>
	Determination of airborne fibre number concentrations : a recommended method, by phase-contrast optical microscopy (membrane filter method) / 

 - Geneva  WHO  1997 
 - viii, 53 p. 
<br/><br/> Includes reference. 
<br/><br/><label>ISBN: </label>9241544961 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental health<br/> Air pollution <br/> Airborne fibre
<br/><br/><label>Dewey Class. No.: </label>363.7  / WOR