Craig, D C <br/><br/>
The efficacy of face-masks.  [electronic resource] 

 -  British dental journal  Feb 1985 
 - 87-90 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0007-0610 
<br/><br/><label>Standard No.: </label>10.1038/sj.bdj.4805540  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air Microbiology<br/>Bacteria--isolation & purification<br/>Communicable Disease Control<br/>Dentists<br/>Humans<br/>Masks<br/>Occupational Diseases--prevention & control<br/>Time Factors