1. Manufacturing Consumption of Energy 1994. Washington, DC: US Department of Energy, Energy Information Administration, 1997.
2. United States Geological Survey. Minerals Yearbook. Washington, DC, USGS, various years.
3. Energy Information Admininstration, US Department of Energy. Emissions of Greenhouse Gases in the United States, 1995. Washington, DC: Energy Information Administration, 1996.
4. Revised 1996 IPCC Guidelines for National Greenhouse Gas Emissions Inventories: Reference Manual. UNEP/WHO/OECD, United Kingdom, 1996.
5. Portland Cement Association. US and Canadian Portland Cement Industry Plant Information Summary. Skokie, IL: Portland Cement Association, 1996.