Nelson, E. W. Report of the Bureau of Ethnology, 18, p. 80. Eskimo. 1896–97.

Hrdlička, A. American Anthropologist, vol. 6, p. 66. Yaqui. 1904.

Bushnell, D. I., Jr. American Anthropologist, vol. 6, n. s., p. 295. Ozark Region. 1904.

MacCurdy, G. G. American Anthropologist, vol. 7, pp. 434 ff. Eolithic. 1905.

Gilder, R. F. American Anthropologist, vol. 9, p. 706. Nebraska. 1907.

Industries.

Powell, J. W. American Anthropologist, 1899, p. 319. Technology. 1899.

Iron.

Holmes, W. H. American Anthropologist, vol. 5, n. s., p. 503. Missouri. 1903.

Iron Age.