Note 6 — 4 THE GREAT ICE AGE
Reading edition
Ernst Antevs, The Last Glaciation (American Geographical Society, Research Series, No. 17, 1928), 74-82. R. A. Daly, The Changing World of the Ice Age (1934), 46. Richard F. Flint, Glacial Geology and the Pleistocene Epoch (1947), 334-335.