PMCCPMCCPMCC

Search tips
Search criteria 

Advanced
Logo of pubhealthreporigLink to Publisher's site
 
Volume 64(8);  February 25, 1949
Article
Public Health Rep. Feb 25, 1949; 64(8): 229–258.
PMCID:
PMC1996960
Articles from Public Health Reports are provided here courtesy of
Association of Schools of Public Health