PMCCPMCCPMCC

Search tips
Search criteria 

Advanced
Logo of pubhealthreporigLink to Publisher's site
 
Volume 64(20);  May 20, 1949
Article
Public Health Rep. May 20, 1949; 64(20): 621–656.
PMCID:
PMC1996972
Articles from Public Health Reports are provided here courtesy of
Association of Schools of Public Health