by Johns Hopkins University

1929

by Johns Hopkins University

1930

by Johns Hopkins University. School of Hygiene and Public Health. Library

1922

by Johns Hopkins University

1930

by Johns Hopkins University. Peabody Institute. Library, George Peabody Library

1892

by Johns Hopkins University

1924

by Johns Hopkins University. Peabody Institute. Library, George Peabody Library

1898

by Johns Hopkins University. School of Hygiene and Public Health

1929

by Johns Hopkins University

1916

by Johns Hopkins University

1913

by Johns Hopkins University

1917

by Johns Hopkins University

1918