Columbia subject headings:
Authors, American--19th century--Biography.
Twain, Mark, 1835-1910--Travel.
West (U.S.)--Description and travel.
Harvard subject headings:
Princeton subject headings:
Authors, American--19th century--Travel--West (U.S.).
Fiction.
Twain, Mark, 1835-1910--Travel--West (U.S.).
West (U.S.)--Description and travel.