Columbia subject headings:
Health officers--America--Biography.
Soper, Fred Lowe, 1893-1977.
Yellow fever--America--Prevention--History.
Yellow fever--Prevention--History.
Harvard subject headings:
Health officers--America--Biography.
Soper, Fred Lowe, 1893-1977
Yellow fever--America--Prevention--History.
Yellow fever--Prevention--History.
Princeton subject headings:
Health officers--America--Biography.
Soper, Fred Lowe, 1893-1977.
Yellow fever--America--Prevention--History.
Yellow fever--Prevention--History.