Mayan characteristics of Civilization sources:
http://www.history.com/topics/mayan-scientific-achievements
http://library.thinkquest.org/08aug/01175/geo.html
http://latinamericanhistory.about.com/od/Maya/p/What-Happened-To-The-Ancient-Maya.htm
http://info.teachtci.com/resources/ha/TheMaya.pdf
http://arapaho.nsuok.edu/~kracht/mayancourse/home.html
http://www.religionfacts.com/mayan_religion/index.htm
http://www.pbs.org/wnet/nature/spirits/html/body_maya.html
http://library.thinkquest.org/08aug/01175/geo.html
http://latinamericanhistory.about.com/od/Maya/p/What-Happened-To-The-Ancient-Maya.htm
http://info.teachtci.com/resources/ha/TheMaya.pdf
http://arapaho.nsuok.edu/~kracht/mayancourse/home.html
http://www.religionfacts.com/mayan_religion/index.htm
http://www.pbs.org/wnet/nature/spirits/html/body_maya.html