http://www.photogrammetry.ethz.ch/research/peru/index.html
http://www.dainst.de/index.php?id=593
http://www.rumbosperu.com/articles/11-50-nazca.htm
http://www.geo.umass.edu/dept_info/hydro/lines.html
http://www.bbc.co.uk/science/horizon/nasca.shtml
http://www-unix.oit.umass.edu/~proulx/
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For additional reading, see Bibliography
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