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costco pharmacy price list adderall The route I had chosen, based on aerial photos, took me up through the Dufek Massif, part of the Pensacola mountains in eastern Antarctica. It turned out to be a good choice: the terrain was free of the many crevasses that can form when ice flows through mountains. Massive peaks carved the horizon into jagged, unpolished landmarks: the Washington mountains to the west, the Forrestal range with Saratoga Table to the east and, there in front of me, the plateau stretching all the way to the South Pole.