Columbia subject headings:
Harte, Bret, 1836-1902.
Twain, Mark, 1835-1910--Friends and associates.
Harvard subject headings:
Harte, Bret, 1836-1902.
Twain, Mark, 1835-1910--Friends and associates.
Princeton subject headings:
Authors, American--19th century--Biography.
Harte, Bret, 1836-1902--Friends and associates.
Twain, Mark, 1835-1910--Friends and associates.