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Microdrills, blades, and cores from the Powell Mound (left: microblades; center: microcores; right: microdrills).

Yerkes, R. W. 1991. Specialization in Shell Artifact Production at Cahokia. In New Perspectives on Cahokia, edited by J. B. Stoltman, pp. 49-64. Monographs in World Archaeology, No. 2. Prehistory Press, Madison. Fig. 3.1, p.53

Image courtesy of Prehistory Press.