Fowke, G. Stone Art. Report of the Bureau of Ethnology, 13, pp. 57 ff. 1891–92.

Wilson, T. Primitive Industry. Report of the Smithsonian Institution, 1892, pp. 521 ff. 1892.

Berlin, A. F. Lehigh Island and its Relics. The Archæologist, 1, Jan., 1893, pp. 13 ff. 1893.

Nordenskiöld, G. The Cliff-Dwellers of the Mesa Verde. Stockholm. 1893.

Schmidt, E. Vorgeschichte Nordamerikas. Braunschweig. 1894.

Wilson, T. The Swastika. Report of the United States National Museum, 1894, pp. 763 ff. 1894.

Prehistoric Art. Report of the United States National Museum, 1896, pp. 325 ff. 1896.

Arrow-Points, Spear-Points, and Knives. Report of the United States National Museum, 1897, I, pp. 811 ff. 1897.

Thomas, C. Introduction to the Study of North American Archæology. Cincinnati. 1898.

Dellenbaugh, F. S. The North Americans of Yesterday. New York. 1901.