Download free USGS topographic map quadrangles in georeferenced PDF (GeoPDF) format by clicking on "Map Locator" on the USGS Store Web site. These files were created using high-resolution scans and average 10-17 megabytes in size. You can search by location, theme, name, and other means to locate the area of interest.
Obtaining topographic maps.
Go to https://store.usgs.gov/ and click on "Map Locator". To use the map locator to find map products use the search bar or drop a pin by double clicking on the map view. Map location pins dropped or searched for by address/place provide products within a 15 mile radius of specified location.