• Aeromagnetic total field, Ashland, U.S.A.
• Aeromagnetic total field, Marquette, U.S.A.
• Aeromagnetic total field, Iron River, U.S.A.
• Aeromagnetic total field, Schreiber, Ontario-U.S.A.
• Aeromagnetic total field, Hancock, Ontario-U.S.A.