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    • Nonmarine Molluscs from the La Playa Site, Sonora, Mexico: 2 

      Drake, Robert J.
      Ceramic cross-dating indicates the La Playa site was occupied by people of the Trincheras Culture ca. A.D. 800-1100. Pisidium, Helisoma, and lymnaeids discussed in a previous report are believed to be of this time. Other ...