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Occurrence of microdrills in American Bottom households.
Yerkes, R.W. 1991. Specialization in Shell Artifact Production at Cahokia. In New Perspectives on Cahokia, edited by James B. Stoltman, pp. 49-64. Monographs in World Archaeology No. 2 Prehistory Press, Madison. Table 3.3, p.60
Image courtesy of Prehistory Press.