FIGURE 6.-Sterling, Va.-Md., 1:24,000-scale, 7.5-min topographic quadrangle map, showing the same area as appendix figure 5. Maps in this USGS series (either line or orthophoto) will be available for the entire coastal zone. FIGURE 7.-Sonoma County, Calif., 1:100,000-scale topographic map, one of the first in a new USGS county series at scales of 1:100,000 or 1:50,000. The maps are formatted on county boundaries rather than parallels and meridians. FIGURE 8.-Hershey, Pa., 1:24,000-scale slope map. Slope maps are available for selected areas. Ranges of slope percentage are shown by various shades of gray. Some USGS slope maps are available with slope zone ranges distinguished by different colors. |