1 in. = 4 miles. (W 104°45ʹ--W 102°15ʹ/N 44°45ʹ--N 43°30ʹ). Relief shown by contours, hachures and spot heights. "Field work 1875. Publication 1879." "Geology of the Black Hills by Henry Newton, E.M."--Upper right margin. Dimensions: 75 x 89 centimeters