Willoughby, C. C. Papers of the Peabody Museum, vol. 1, 6, p. 24. Maine. 1898.

Perforated Stones.

Henshaw, H. W. Bulletin of the Bureau of Ethnology, 2, pp. 5 ff. California. 1887.

Fison, L. American Anthropologist, vol. 2, p. 177. New Britain. 1889.

Perforators.

McGuire, J. D. Report of the United States National Museum, 1894, pp. 623 ff. A general discussion. 1894.

Mason, O. T. International Congress of Anthropology, p. 73. 1894.

Sherman, G. M. American Archæologist, 1898, p. 45. 1898.

Bushnell, D. I., Jr. American Anthropologist, vol. 10, n. s., p. 540. Virginia. 1908.

West, G. A. Wisconsin Archeologist, vol. 8, 2, pp. 37 ff. 1909.