Early immigrants, earlier
The multiple-origin theory of ancient New World immigration reported in "Continental Survivors: Baja skulls shake up American ancestry" (SN: 9/6/03, p. 150: Continental Survivors: Baja skulls shake up American ancestry) has a long and respectable scholarly history, though it's tarnished from time to time by enthusiasts for one race or another. For an early popular treatment, see Men out of Asia by Harold Sterling Gladwin (1947, McGraw-Hill). Gladwin even mentioned the Pericú, who were cited in the article.
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