| Literature DB >> 6066904 |
T F Williams, D A Martin, M D Hogan, J D Watkins, E V Ellis.
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Year: 1967 PMID: 6066904 PMCID: PMC1227176 DOI: 10.2105/ajph.57.3.441
Source DB: PubMed Journal: Am J Public Health Nations Health ISSN: 0002-9572