All TOPO's $13.95 each

The best known USGS maps are those of the 7.5-minute, 1:24,000-scale quadrangle series. A scale of 1:25,000 has been used for some maps based on metric units (1 centimeter = 0.25 kilometer). The area portrayed on each sheet ranges from 64 square miles at latitude 30 degrees north to 49 square miles at latitude 49 degrees north. A scale of 1:24,000 allows considerable detail to be shown in the quadrangle areas; 2.64 inches = 1 mile.

Maps are ordered alphabetically by city.