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Pa Board of Health and Vita Statistics

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Annual Report of the Secretary of Internal Affairs of the Commonwealth of Pennsylvania, 1903, Vol. 31 Part III. , Industrial Statistics (Classic Reprint)
Proceedings of the State Sanitary Convention Held at Philadelphia, May 12, 13 and 14, 1886, Under the Auspices of the State Board of Health and Vital Statistics of the Commonwealth of Pennsylvania (Classic Reprint)