Determination of airborne fibre number concentrations : a recommended method, by phase-contrast optical microscopy (membrane filter method). 

 - 53p. 
<br/><br/><label>ISBN: </label>92-4-154496-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air pollutants, Occupational--Analysis<br/>Environmental monitoring--Methods<br/>Microscopy, Phase-contrast