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Digital Raster Graphics USGS GeoPDF is in the public domain and available from the Research and Distribution Center for the cost of reproduction.
US Topo GeoPDF maps are digital topographic maps produced by the National Geospatial Program of the U.S. Geological Survey (USGS). Created in the familiar 7.5-minute quadrangle format like the legacy paper maps, US Topo GeoPDF maps support frequent updating, wide and fast public distribution, and basic, on-screen geographic analysis. Users can turn US Topo data layers on and off as needed, zoom in and out to examine specific features or see a broader area, and print the maps in their entirety or in customized sections on a broad array of printing devices.
Viewing and analytical tools are available for free download from Adobe and TerraGo Technologies. File size for each US Topo is about 15-20 megabytes. US Topo maps are produced by the USGS National Geospatial Technical Operations Center.