Metal WikipediaIn preColumbian America, objects made of tumbaga, an alloy of copper and gold, started being produced in Panama and Costa Rica between 300–500 CE. Small metal sculptures were common and an extensive range of tumbaga (and gold) ornaments comprised the .
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Economy of Iran WikipediaThe economy of Iran is a mixed and transition economy with a large public sector. It is the world's eighteenth largest by purchasing power parity (PPP). [2] Some 60 percent of .
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THE MINERAL INDUSTRIES OF CENTRAL AMERICATHE MINERAL INDUSTRIES OF CENTRAL AMERICA—2001 1Revised on March 16, 2004. 2References that include a section twist (§) are found in the Internet References section. THE MINERAL INDUSTRIES OF CENTRAL AMERICA1 BELIZE, COSTA RICA, EL SALVADOR, GUATEMALA, HONDURAS, NICARAGUA, AND PANAMA By Pablo Velasco the United States and the United .
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