Columbia subject headings:
Authors, American--19th century--Biography.
O'Connor, William Douglas, 1832-1889.
Whitman, Walt, 1819-1892--Friends and associates.
Harvard subject headings:
Authors, American--19th century--Biography
O'Connor, William Douglas, 1832-1889--Biography.
O'Connor, William Douglas, 1832-1889.
Whitman, Walt, 1819-1892--Friends and associates.
Princeton subject headings: