Columbia subject headings:
Twain, Mark, 1835-1910--Bibliography--Periodicals.
Twain, Mark, 1835-1910--Periodicals.
Harvard subject headings:
Twain, Mark, 1835-1910--Bibliography.
Twain, Mark, 1835-1910--Periodicals.
Princeton subject headings:
Periodicals.
Twain, Mark, 1835-1910--Bibliography.
Twain, Mark, 1835-1910--Periodicals.