American Anthropologist, vol. 5. 1892.
Holmes. Science, November 25, 1892.
Wright, G. F. Man and the Glacial Period. 1892.
Claypole. Popular Science Monthly for April, 1893.
Wright, G. F. Popular Science Monthly for May, 1893.
Holmes. Journal of Geology, 1, nos. 1 and 2. 1893.
Science, January 25, 1893.
McGee. American Anthropologist, vol. 6. 1893.
Mercer. American Naturalist, XXVII. 1893.
Claypole. American Geologist, XVIII. 1896.