Bibliography

http://www.britannica.com/EBchecked/topic/628935/Cordillera-de-Vilcabamba

http://www.cuscoonline.com/english/info0100.shtml

http://www.climate-charts.com/Locations/p/PR84686.php

http://util.peru.com/peruinfo/ingles/info_dptos/cuzco/cu_geo.htm

http://geographyfieldwork.com/MachuTourismImpact.htm

http://www.volcano.si.edu/world/volcano.cfm?vnum=1504-00-

http://whatonearth.olehnielsen.dk/plates/southamerican.asp

http://daveslandslideblog.blogspot.com/search?q=cusco

World Geographical Encyclopedia: The Americas.  McGraw-Hill, Inc.  (237)