"Ancient ceremonial plaza found in Peru" ANDREW WHALEN, Associated Press Writer, [1]
weatherbase.com
"Weatherbase: Chimbote, Peru," [3], accessed 25 Jan 2016. Chimbote, the nearest weather station to the Casma Valley, receives an average of 0.4 inches of precipitation annually all of it from January to April.
web.archive.org
"Oldest Urban Site in the Americas Found, Experts Claim", National Geographic News, Feb 26, 2008, [2], accessed 20 Jan 2016
"Oldest Urban Site in the Americas Found, Experts Claim", National Geographic News, Feb 26, 2008, [4], accessed 20 Jan 2016
