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Smithsonian May 2007 Anne Bolen	The New World's Oldest Calendar Research at a 4,200-year-old temple in Peru yields clues to an ancient people who may have clocked the heavens
Geotimes March 2007 Margaret Putney	Peru's Ancient Solar Observatory A line of 2,300-year-old stone towers north of Lima, Peru, form the oldest known solar observatory in the Americas, a team of archaeologists has found.
Geotimes August 2003 William E. Brooks	Mineral Resources of Peru's Ancient Societies The success of at least a half-dozen pre-Columbian societies dating back 3,000 years and subsequent Spanish colonization in the 1400s has rested on the effective use of northern Peru's abundant resources.