Columbia subject headings:
Harvard subject headings:
Darwin, Charles, 1809-1882. Expression of the emotions in man and animals--Sources.
Darwin, Charles, 1809-1882. Expression of the emotions in man and animals.
Emotions
Facial expression.
Instinct.
Naturalists--Correspondence.
Psychology, Comparative.
Princeton subject headings:
Darwin, Charles, 1809-1882. Expression of the emotions in man and animals--Sources.
Facial expression.
Naturalists--Correspondence.