Columbia subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994--Drama.
Operas--Librettos.
Harvard subject headings:
Nixon, Richard M. (Richard Milhous), 1913-1994--Drama.
Operas--Librettos
Princeton subject headings:
Drama.
Librettos.
Nixon, Richard M. (Richard Milhous), 1913-1994--Drama.
Operas--Librettos.