Columbia subject headings:
Authors, American--19th century--Biography.
Mississippi River--In literature.
Twain, Mark, 1835-1910.
Twain, Mark, 1835-1910. Life on the Mississippi.
Harvard subject headings:
Authors, American--19th century--Biography
Biographies.
Mississippi River Valley--Intellectual life--19th century.
Mississippi River--In literature.
Twain, Mark, 1835-1910--Biography.
Twain, Mark, 1835-1910--Homes and haunts--Mississippi River.
Twain, Mark, 1835-1910. Life on the Mississippi.
Princeton subject headings:
Authors, American--19th century--Biography.
Mississippi River--In literature.
Twain, Mark, 1835-1910.
Twain, Mark, 1835-1910. Life on the Mississippi.