Columbia subject headings:
Medicine--Canada--History--Bibliography.
Medicine--History--Bibliography.
Medicine--United States--History--Bibliography.
Harvard subject headings:
Canada
Medicine--Canada--Bibliography.
Medicine--Canada--History--Bibliography.
Medicine--History--Bibliography
Medicine--United States--Bibliography of bibliographies.
Medicine--United States--History--Bibliography.
United States
Princeton subject headings:
Medicine--Canada--History--Bibliography.
Medicine--History--Bibliography.
Medicine--United States--History--Bibliography.