1. How sickness was prevented at Johnstown Author(s): Groff, Geo. G. (George G.), 1851-1910 Publication: [New York? : s.n., 1890] Subject(s): DisastersPublic Health PracticePennsylvaniaPennsylvania. State Board of Health and Vital Statistics.
2. Address of the State Board of Health and Vital Statistics of the Commonwealth of Pennsylvania, to the people of Pennsylvania Author(s): Pennsylvania. State Board of Health and Vital Statistics, author. Publication: Harrisburg : E.K. Meyers, state printer, 1885 Subject(s): Public Health PracticeState GovernmentPennsylvania