Columbia subject headings:
Clarke, Charles Cowden, 1787-1877.
Clarke, Mary Cowden, 1809-1898.
Harvard subject headings:
Clarke, Charles Cowden, 1787-1877.
Clarke, Mary Cowden, 1809-1898.
Princeton subject headings:
Clarke, Charles Cowden, 1787-1877.
Clarke, Mary Cowden, 1809-1898.