This week’s atlas is the United States Geological Survey’s National Map, a collection of 7.5 minute topographic maps. Produced from GIS (Geographic Information Systems) databases, these maps, called quadrangles, show the roads, elevation, and bodies of water of every square inch in the United States. The maps are all to the same scale (1:24,000) and can be easily downloaded or purchased. All the user has to do is type in the zip code or city that they would like to see and click “Go”. The database then returns all available current (as of 2016) and historical maps for that area.