| http://www.w3.org/ns/prov#value | - On July 16 and July 17, NASA's ER-2 aircraft flew above Alaskan glaciers and to the North Pole, carrying an instrument called the Multiple Altimeter Beam Experimental Lidar, or MABEL. MABEL is a laser altimeter, measuring the elevation of glaciers, mountains, forests and other topography below.
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