Columbia subject headings:
Harvard subject headings:
Browning, Robert, 1812-1889.
Foote, Mary Hallock, 1847-1938
Twain, Mark, 1835-1910
Princeton subject headings:
Browning, Robert, 1812-1889.
Foote, Mary Hallock, 1847-1938--Correspondence.
Twain, Mark, 1835-1910. Correspondence.