Hedrich, A W <br/><br/>
THE "NORMAL" FOR EPIDEMIC DISEASES.  [electronic resource] 

 -  American journal of public health (New York, N.Y. : 1912)  Jul 1927 
 - 691-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0271-4353 
<br/><br/><label>Standard No.: </label>10.2105/ajph.17.7.691  doi