Columbia subject headings:
History--Philosophy.
Idealism.
Philosophy of nature.
Philosophy, Modern.
Psychoanalysis and philosophy.
Psychologism.
Transcendentalism.
Harvard subject headings:
History--Philosophy
Idealism.
Philosophy of nature.
Philosophy, Modern.
Psychoanalysis and philosophy.
Psychologism.
Transcendentalism.
Princeton subject headings:
Idealism.
Philosophy of nature.
Psychologism.
Transcendentalism.