Leasable mineral and waterpower land classification map of the Great Falls 1 x 2 Quadrangle, Montana lands withdrawn, classified and prospectively valuable for leasable minerals; occurrences of other selected minerals; and lands withdrawn or classified for waterpower and reservoir sites
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"Leasable mineral and waterpower land classification map of the Great Falls 1 x 2 Quadrangle, Montana lands withdrawn, classified and prospectively valuable for leasable minerals; occurrences of other selected minerals; and lands withdrawn or classified for waterpower and reservoir sites." (1978)