Copyrights: Isostatic gravity anomaly C.I., 1 milligals elev. factor, .066 mgl. 1 ft. regional township section map townships 20-25S, ranges 49-53W, township 26S, ranges 49-52W, township 27S, ranges 49-51W, & township 28S, ranges 49-50W. By EdgarTobin Aerial Surveys, Margaret Batts Tobin, individually & as executrix of the Estate of Edgar G. Tobin, owner
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