Columbia subject headings:
Howitt, Mary (Mary Botham), 1799-1888.
Howitt, William, 1792-1879.
Harvard subject headings:
Howitt, Mary (Mary Botham), 1799-1888
Howitt, Mary (Mary Botham), 1799-1888.
Howitt, William, 1792-1879.
Princeton subject headings:
Howitt, Mary (Mary Botham), 1799-1888.
Howitt, William, 1792-1879.