Columbia subject headings:
Hookworm disease--Southern States--Prevention--History--20th century.
Public health--Southern States--History--20th century.
Rockefeller Sanitary Commission for the Eradication of Hookworm Disease--History.
Harvard subject headings:
Hookworm disease--Southern States--Prevention--History--20th century.
Public health--Southern States--History--20th century.
Rockefeller Sanitary Commission for the Eradication of Hookworm Disease--History.
Rockefeller Sanitary Commission for the Eradication of Hookworm Disease.
Princeton subject headings: