Columbia subject headings:
Darwin, Charles, 1809-1882.
Evolution--History.
Naturalists--England--Biography.
Wallace, Alfred Russel, 1823-1913.
Harvard subject headings:
Darwin, Charles, 1809-1882
Evolution (Biology)--History
Evolution--History
Naturalists--England--Biography
Wallace, Alfred Russel, 1823-1913
Princeton subject headings:
Darwin, Charles, 1809-1882.
Evolution--History.
Naturalists--England--Biography.
Wallace, Alfred Russel, 1823-1913.