Columbia subject headings:
Twain, Mark, 1835-1910.
Harvard subject headings:
Authors, American--19th century--Biography
Biographies
Twain, Mark, 1835-1910
Princeton subject headings:
Authors, American--19th century--Biography.
Humorists, American--19th century--Biography.
Journalists--United States--Biography.
Twain, Mark, 1835-1910.