The United States Geological Survey (USGS) provides data on many different science topics. Most of it can be downloaded for free from our website. Our Science Data Catalog is a good starting point. Also try using your browser's search engine and including the keyword "usgs.gov".
If you are looking for a particular data set and cannot find it through Internet searches or our Science Data Catalog, please call USGS Science Information Services toll-free at 1-888-392-8545 or use this website to send us a message or to initiate a live Web chat with a Science Information Specialist.