Alaska 1981 Alaskan Pipeline 1981USA Alaska Alaskan Pipeline 1981USA Alaska Arctic Ocean Alaska t 1981USA Alaska Arctic Ocean Alaska 1981USA Alaska Arctic_Ice_Cap 1981USA Alaska Artic_Ice_Cap 1981USA Alaska Barrow Alaska 1981USA Alaska BridgeBarrow 1981USA Alaska Prudhoe Bay Pipeline 1981USA Alaska Prudhoe Bay Zero Marker 1981USA Alaska USA Alaska Pt Barrow Bridge