Symposium on Evolution : held at Duquesne University, April 4, 1959, in commemoration of the centenary of Charles Darwin's The Origin of Species - Bawden, F. C. (Frederick Charles), 1908-1972; Boelen, Bernard J.; Lang, Gottfried O.; Vollert, Cyril; van Melsen, Andrew G. (Pittsburgh : Duquesne University, 1959)