Columbia subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994--Impeachment.
Nixon, Richard M. (Richard Milhous), 1913-1994.
Harvard subject headings:
Legislative hearings
Nixon, Richard M. (Richard Milhous), 1913-1994
Nixon, Richard M. (Richard Milhous), 1913-1994--Impeachment.
Princeton subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994.