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The U.S. Geological Survey Energy Resources Program has developed coal databases to monitor the location, quantity, and physical and chemical characteristics of U.S. coal and coal-related deposits. The National Coal Resources Data System (NCRDS) database is an integrated system utilizing commercial software to produce maps, resource calculations, and coal quality location maps. NCRDS correlates and standardizes coal data from Federal and State agencies, universities, the private sector, and foreign countries. NCRDS is comprised of three major components, of which two are available online: