| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Piedras Negras, city, Mexico |
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| city (1990 pop. 96,178), Coahuila state, N Mexico, on the Rio Grande opposite Eagle Pass, Tex. Founded in 1849, the city grew as an international shipping point. Piedras Negras is a commercial and processsing center for the surrounding agricultural region. Industry includes coal mining and metal-ore furnaces. In 1888, Piedras Negras was renamed Ciudad Porfirio Díaz in honor of the dictator, but the old name was restored after his overthrow. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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