Map of the Most Productive Part of the Breckenridge Mining District, Showing Some of the Principal Mine Workings and Known Faults and Veins. The United States Geological Survey publishes topographic maps of the entire united states. These maps are often used as the basis for other commercial map products and they serve as one of the best tools available for navigating the country’s wild and urban terrain. The maps show contour lines (lines of equal elevation) which depict natural features of the land, as well as streams, roads, trails, forest types, buildings, and other natural man-made features. It has become more difficult over the years to find these older publication dates.