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The clay eaters

...dirt is a specific disorder known as geophagia, Dr. Grigsby said. "Pica exists all...ice and earth," Dr. Grigsby said. Geophagia is usually found in children and is often...there is a great deal of information on geophagia, no one has systematically looked at...

http://chronicle.augusta.com/stories/1999/03/18/ent_256491.shtml
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