Columbia subject headings:
American wit and humor--History and criticism.
Twain, Mark, 1835-1910--Humor.
Wit and humor--Social aspects--History--19th century.
Harvard subject headings:
American wit and humor--History and criticism
Twain, Mark, 1835-1910--Humor.
Wit and humor--Social aspects--History--19th century.
Princeton subject headings:
American wit and humor--History and criticism.
Twain, Mark, 1835-1910--Humor.
Wit and humor--Social aspects--History--19th century.