Columbia subject headings:
Arnold, Matthew, 1822-1888.
Bradlaugh, Charles, 1833-1891.
Huxley, Thomas Henry, 1825-1895.
Kingsley, Charles, 1819-1875.
Martineau, Harriet, 1802-1876.
Maurice, Frederick Denison, 1805-1872.
Stephen, Leslie, 1832-1904.
Harvard subject headings:
Princeton subject headings:
Arnold, Matthew, 1822-1888.
Bradlaugh, Charles, 1833-1891.
Huxley, Thomas Henry, 1825-1895.
Kingsley, Charles, 1819-1875.
Martineau, Harriet, 1802-1876.
Maurice, Frederick Denison, 1805-1872.
Stephen, Sir Leslie, 1832-1904.