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Aeromagnetic map of Minnesota, north-central region--Bigfork quadrangle, total magnetic intensity anomaly
Aeromagnetic map of Minnesota, north-central region-- Little Fork snf International Falls quadrangles, total magnetic intensity anomaly
Aeromagnetic map of Minnesota, north-central region--Blackduck quadrangle, total magnetic intensity anomaly
Aeromagnetic map of Minnesota, north-central region--Upper Red Lake quadrangle, total magnetic intensity anomaly
Aeromagnetic map of Minnesota, north-central region--Baudette quadrangle, total magnetic intensity anomaly