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

by Henry Fairfield Osborn

(57) Op. cit., p. 108.

(58) Huntington, 1907.1.

(59) Leverett, 1910.1.

(60) Obermaier, 1912.1, p. 132.

(61) Penck, 1908.1; 1909.1.

(62) Geikie, 1914.1, p. 312.

(63) Wiegers, 1913.1.

(64) Boule, 1888.1.

(65) Schuchardt, 1913.1, p. 144.

(66) Obermaier, 1909.2; 1912.1.