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Plano(plā`nō), city (1990 pop. 128,713), Collin co., N Tex., less than 20 mi (32 km) NE of Dallas; inc. 1873. In a farm and livestock area on the blackland prairie, Plano is a booming financial and commercial center, with headquarters of many large national corporations. Among its manufactures are plumbing supplies; paper, medical, and metal products; cable; and communications equipment. The city was reached by railroad in 1872 but was almost destroyed by fire in 1881. Major urban growth began in the 1970s; large office complexes and housing developments were constructed in the late 20th cent. as the Dallas–Fort Worth metropolitan area burgeoned. Plano remains one of the fastest-growing U.S. cities.
a Mesolithic culture of North America (eighth-sixth millennia B.C.), which replaced the Folsom culture on the Great Plains and in the Southwestern USA. It was discovered in the 1920’s in the vicinity of Yuma, Arizona, by the American scholars P. Anderson and G. Anderson. The Piano culture is characterized by stone points, which were part of throwing weapons. The points are mainly triangular and leaf-shaped, with a straight, concave, or convex base. Generally found at hunting campsites, they represent the main type of weapon used by ancient bison hunters. Certain elements of the culture were retained in the Archaic culture (sixth and fifth millennia B.C.), which succeeded the Piano culture.
REFERENCESWormington H. M. Ancient Man in North America, 4th ed. Denver, 1957.
Krieger, A. D. “Early Man in the New World.” In the collection Prehistoric Man in the New World. Chicago, 1964.