Columbia subject headings:
Twain, Mark, 1835-1910--Books and reading.
Twain, Mark, 1835-1910--Library--Catalogs.
Harvard subject headings:
Private libraries--United States--Catalogs.
Twain, Mark, 1835-1910--Books and reading.
Twain, Mark, 1835-1910--Library--Catalogs.
Princeton subject headings:
Twain, Mark, 1835-1910--Books and reading.
Twain, Mark, 1835-1910--Library--Catalogs.