Men of the Old Stone Age: Their Environment, Life and Art

by Henry Fairfield Osborn

(47) Dana, 1875.1, p. 591.

(48) Walcott, 1893.1.

(49) Upham, 1893.1, p. 217.

(50) Heim, 1894.1.

(51) Sollas, 1900.1.

(52) Penck, 1909.1, vol. III, pp. 1153-1176.

(53) Geikie, 1914.1, p. 302.

(54) Reeds, 1915.1.

(55) Nüesch, 1902.1.

(56) Geikie, op. cit., pp. 111-114.