Columbia subject headings:
Harvard subject headings:
Emerson, Ralph Waldo, 1803-1882
Fechner, Gustav Theodor, 1801-1887.
Feuerbach, Ludwig, 1804-1872.
Philosophy, Modern--19th century.
Princeton subject headings:
Emerson, Ralph Waldo, 1803-1882.
Fechner, Gustav Theodor, 1801-1887.
Feuerbach, Ludwig, 1804-1872.
Philosophy--History--19th century.