FILE - In this Nov. 21, 1996, file photo, tourists cast their shadows on the ancient Anasazi ruins of Chaco Canyon in N.M. Oil and gas drilling on tens of thousands of acres surrounding a national park in northwestern New Mexico would be prohibited under legislation introduced by two U.S. senators. The effort to establish a "protection zone" around Chaco Culture National Historical Park is the latest salvo in a long-running battle among developers and environmental and tribal interests. (AP Photo/Eric Draper, File)
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