Columbia subject headings:
Gilbert, W. S. (William Schwenck), 1836-1911.
Sullivan, Arthur, 1842-1900.
Harvard subject headings:
Gilbert, W. S. (William Schwenck), 1836-1911
Sullivan, Arthur, 1842-1900
Princeton subject headings:
Gilbert, W. S. (William Schwenck), 1836-1911.
Sullivan, Arthur, 1842-1900.