Columbia subject headings:
Biology--United States--History.
Darwin, Charles, 1809-1882. On the origin of species.
Natural selection.
Harvard subject headings:
Biology--United States--History.
Darwin, Charles, 1809-1882. On the origin of species.
Natural selection.
Princeton subject headings:
Biology--United States--History.
Darwin, Charles, 1809-1882. On the origin of species.
Natural selection.