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Former UArizona graduate students Sharlot Hart  and Mario Battaglia record the physical attributes of a trail used by the Tohono O'odham in Organ Pipe Cactus National Monument. The work was part of a project to find and document the ancient trails so the (left) Former UArizona graduate students Sharlot Hart and Mario Battaglia record the physical attributes of a trail used by the Tohono O'odham in Organ Pipe Cactus National Monument. The work was part of a project to find and document the ancient trails so the National Park Service can preserve and protect them.