Determination of airborne fibre number concentrations :  a recommended method, by phase-contrast optical microscopy, membrane filter method / 
World Health Organization. 
 - Geneva :  World Health Organization,  1997. 
 - viii, 53 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references (p. 42-43). 
<br/><br/><label>ISBN: </label>9241544961 
<br/><br/><label>LCCN: </label>98119909  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Pollution.<br/>Environmental monitoring.<br/>Industrial hygiene.
<br/><br/><label>LC Class. No.: </label>TD883.1  / .D474 1997 
<br/><br/><label>Dewey Class. No.: </label>628.5/3