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Please excuse crossposting--
 
Those who have access to the New York Times might be interested in the
May 19th A section article on hiding historical sites from potential
looters.  The article describes the efforts of various federal
agencies to have historic sites, particulary ancient ruins in the
southwest, removed from both commercial and U.S.G.S. maps.  According
to the article, the Survey is deleting historic sites as maps are
revised.