Open AccessCommunications
Author(s) -
Donald B. Armstrong
Publication year - 1916
Publication title -
american journal of public health
Language(s) - Uncategorized
Resource type - Journals
eISSN - 2330-9687
pISSN - 0271-4353
DOI - 10.2105/ajph.6.3.300
Subject(s) - political science , medicine , telecommunications , library science , engineering , computer science