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. The work of the sanitary engineer in time of epidemics, in time of war, and in sudden calamities in civic life Author(s): Gerhard, Wm. Paul (William Paul), 1854-1927 author Publication: New York : Burr Printing House, 1895 Subject(s): Sanitary EngineeringEpidemicsArmed ConflictsDisasters