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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Hammond J. R. Substate district, HSA, and PSRO area designations. Am J Public Health. 1976 Aug;66(8):788–790. doi: 10.2105/ajph.66.8.788. [DOI] [PMC free article] [PubMed] [Google Scholar]
