by J.P. Dart, Mining Engineer ; A. L. Bancroft & Co. Lith. S.F. Coordinates approximate and based on Greenwich meridian. Compass rose. "Scale - 1 mile to the in." Shows drainage, township and section lines, mining claims, land ownership, ditches, roads and trails. Illustrations of trees: white oak, scrub pine, black oak, red pine, fir, sugar pine. "Sonora, August, 1879 Copyright."