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Spiral Jetty
http://www.artnews.com/2016/02/04/spiral-jetty-may-become-utahs-official-state-work-of-art/
http://www.getty.edu/conservation/publications_resources/videos/focus/spiral_jetty.html
http://www.robertsmithson.com/earthworks/spiral_jetty.htm
http://www.diaart.org/sites/main/spiraljetty
