Am J Public Health Nations Health. 1957 Feb;47(2):243-5. doi: 10.2105/ajph.47.2.243.
American journal of public health and the nation's health
M H Merrill
PMID: 18017609 PMCID: PMC1551171 DOI: 10.2105/ajph.47.2.243
[No abstract available.]