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A line has been drawn under this number . " The statutory definition of " Tribal lands " has been elaborated to clarify that the regulations do not apply to strictly private land located within the boundaries of an Indian reservation but do apply to allotments held in trust or subject to a restriction on alienation by the United States . This acute care orientation , which has been institutionalized through the role of physicians as gatekeepers in the health care system , has tended to slight prevention and rehabilitation , even though almost half of the U.S. population has chronic health conditions . The statutory definition of " Federal lands " has been elaborated to clarify that " control " refers to " those lands in which the United States has a legal interest sufficient to permit it to apply these regulations without abrogating the otherwise existing legal rights of a person . President Frohnmayer reported that the basketball arena project has been placed on indefinite hold . Addison 's disease , brain tumor , and the like - - there is no assurance that such a condition will be recognized by the medically trained psychotherapist who may have a low index of suspicion , particularly if the patient has been referred by an internist . Emphasis has been placed on sustainable site location , water efficiency , energy conservation , indoor air quality and using materials that are either harvested sustainably or made from recyclable materials .