Am J Public Health Nations Health. 1956 Feb;46(2):229-32. doi: 10.2105/ajph.46.2.229.
American journal of public health and the nation's health
M H Merrill
PMID: 18017554 PMCID: PMC1623502 DOI: 10.2105/ajph.46.2.229
[No abstract available.]