• Aeromagnetic total field, Alpena, Ontario-U.S.A.
• Aeromagnetic total field, Flint, Ontario-U.S.A.
• Aeromagnetic total field, Tawas City, Ontario-U.S.A.
• Aeromagnetic total field, Blind River, Ontario-U.S.A.
• Aeromagnetic total field, Ashland, U.S.A.