利尻-遠別海域空中磁気図 = Total intensity aeromagnetic map off the coast of Rishiri-Embetsu area ; 遠別-留萌海域空中磁気図 = Total intensity aeromagnetic map off the coast of Embetsu-Rumoi area ; 留萌-札幌海域空中磁気図 = Total intensity aeromagnetic map off the coast of Rumoi-Sapporo area / 地質調査所 [編]. -- 地質調査所, 1972. -- (空中磁気図 = Total intensity aeromagnetic maps ; 2-1,2,3,4). a.