Columbia subject headings:
Harvard subject headings:
American literature--19th century--History and criticism
Authors, American--19th century--Biography
Humorists, American--19th century--Biography.
Twain, Mark, 1835-1910
Princeton subject headings:
American literature--19th century--History and criticism.
Authors, American--19th century--Biography.
Humorists, American--19th century--Biography.
Twain, Mark, 1835-1910.