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Piedras Negras (city, Mexico)

Piedras Negras, 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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"Piedras Negras (city, Mexico)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 28 Jun. 2017 <http://www.encyclopedia.com>.

"Piedras Negras (city, Mexico)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (June 28, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/piedras-negras-city-mexico

"Piedras Negras (city, Mexico)." The Columbia Encyclopedia, 6th ed.. . Retrieved June 28, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/piedras-negras-city-mexico

Piedras Negras (ancient city, Guatemala)

Piedras Negras (pyā´ŧħräs nā´gräs) [Span.,=black stones], ruined city of the Classic era of the Maya, NW Petén, Guatemala, in the Usumacinta valley. Reaching a peak of sculptural achievement (according to one dating system, between 731 and 795), Piedras Negras developed some of the finest pre-Columbian stonework.

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"Piedras Negras (ancient city, Guatemala)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 28 Jun. 2017 <http://www.encyclopedia.com>.

"Piedras Negras (ancient city, Guatemala)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (June 28, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/piedras-negras-ancient-city-guatemala

"Piedras Negras (ancient city, Guatemala)." The Columbia Encyclopedia, 6th ed.. . Retrieved June 28, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/piedras-negras-ancient-city-guatemala