Columbia subject headings:
Authors, American--19th century--Biography.
Biographies.
Emerson, Ralph Waldo, 1803-1882--Friends and associates.
Friendship--United States--History--19th century.
Thoreau, Henry David, 1817-1862--Friends and associates.
Harvard subject headings:
Authors, American--19th century--Biography
Biographies.
Emerson, Ralph Waldo, 1803-1882--Friends and associates.
Friendship--United States--History--19th century.
Thoreau, Henry David, 1817-1862--Friends and associates.
Princeton subject headings:
Authors, American--19th century--Biography.
Emerson, Ralph Waldo, 1803-1882--Friends and associates.
Friendship--United States--History--19th century.
Thoreau, Henry David, 1817-1862--Friends and associates.