Evolution by natural selection. (Introduction to the sketch of 1842 and the essay of 1844 by Sir Francis Darwin. Charles Darwin's sketch of 1842 ... Charles Darwin's essay of 1844 ... on the tendency of species to form varieties; and on the perpetuation of varieties and species by natural means of selection /
International Congress of Zoology(1958)
Darwin, Charles,1809-1882.
Wallace, Alfred Russel,1823-1913.
Cambridge,
1958.