Columbia subject headings:
Authors, American--19th century--Biography--Congresses.
Psychology and literature--Congresses.
Thoreau, Henry David, 1817-1862--Psychology--Congresses.
Harvard subject headings:
Authors, American--19th century--Biography--Congresses.
Authors, American--19th century--Psychology--Congresses.
Psychology and literature--Congresses.
Thoreau, Henry David, 1817-1862--Biography--Character--Congresses.
Thoreau, Henry David, 1817-1862--Psychology--Congresses.
Princeton subject headings:
Authors, American--19th century--Biography--Congresses.
Psychology and literature--Congresses.
Thoreau, Henry David, 1817-1862--Psychology--Congresses.