Columbia subject headings:
Philosophy in literature.
Twain, Mark, 1835-1910--Criticism and interpretation.
Twain, Mark, 1835-1910--Philosophy.
Harvard subject headings:
Philosophy in literature.
Twain, Mark, 1835-1910--Criticism and interpretation.
Twain, Mark, 1835-1910--Philosophy.
Princeton subject headings:
Philosophy in literature.
Twain, Mark, 1835-1910--Criticism and interpretation.
Twain, Mark, 1835-1910--Philosophy.