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2. Olmec Art of Ancient Mexico 1996
3. Regional Perspectives on the Olmec 1989
4. Olmec archaeology: A half century of research and its accomplishments
5. A. Cyphers, in Olmec to Aztec: Settlement Patterns in the Ancient Gulf Lowlands, B. Stark, P. Arnold III, Eds. (Univ. of Arizona Press, Tucson, AZ, 1997), pp. 96–114.