Am J Public Health Nations Health. 1953 Jul;43(7):840-3. doi: 10.2105/ajph.43.7.840.
American journal of public health and the nation's health
J D PORTERFIELD
PMID: 13065536 PMCID: PMC1620320 DOI: 10.2105/ajph.43.7.840
[No abstract available.]
Keywords: PUBLIC HEALTH/statistics