[1523] Transactions of the Chicago Academy of Sciences, vol. i. p. 232, pl. xxii, fig. 3.
[1524] The aboriginal relics called “sinkers” or “plummets” in Amer. Journal of Archæology, vol. i. p. 105.
[1525] The Epoch of the Mammoth and the Apparition of Man upon the Earth, by James C. Southall, p. 399 (Philadelphia, 1878).
[1526] Schoolcraft’s Indian Tribes of the United States, vol. i. p. 101 (Philadelphia, 1851).
[1527] S. B. J. Skertchly in the Journal Anthrop. Inst., vol. xvii. p. 335 (Jan. 10, 1888).
[1528] The American Naturalist, vol. xxi. p. 459 (1887).
[1529] Early Man in America, in the North American Review, Oct., 1883, p. 340.
[1530] The Auriferous Gravels, etc., p. 273.
[1531] Ibid. p. 242.
[1532] Sixth annual report of the U. S. Geol. Surv. of the Territories, p. 29.