1. Annual address: modes of infection Author(s): Welch, William Henry, 1850-1934, author Publication: [Baltimore?] : [publisher not identified], [1887?] Subject(s): Communicable Diseases -- etiologyDisease Transmission, Infectious
2. Considerations concerning some external sources of infection in their bearing on preventive medicine: the address in state medicine delivered before the American Medical Association at Newport on June 28, 1889 Author(s): Welch, William Henry, 1850-1934, author Publication: [Philadelphia?] : [publisher not identified], [1889?] Subject(s): Communicable Diseases -- etiologyDisease Reservoirs
