Columbia subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994.
Presidents--United States--Biography.
Harvard subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994
Presidents--United States--Biography
United States--Politics and government--1969-1974.
Princeton subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994.
Presidents--United States--Biography.