Wells, William Firth <br/><br/>
Air born contagion and air hugiene: an ecological study of doplet infections  by William Firth Wells. 

 - Massachusetts  Harvard University  1955 
 - xxix, 423p.: ill 24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecological study Hygine products. 
<br/><br/><label>Dewey Class. No.: </label>613.1  / W29A