Nicas, M <br/><br/>
Issues for variability.  [electronic resource] 

 -  American Industrial Hygiene Association journal   
 - 428-31 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>0002-8894 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humans<br/>Occupational Exposure--prevention & control<br/>Respiratory Protective Devices--standards