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References

  • Goonan, T. G. 2009. Nickel recycling in the United States in 2004. Chapter Z in Flow studies for recycling metal commodities in the United States, edited by S. F.Sibley. Reston , VA : U.S. Geological Survey Circular 1196, pp. Z1Z30.
  • Ober, J. A. 2002. The materials flow of sulfur in the United States. Reston , VA : U.S. Geological Survey Open File Report 02-298.
  • U.S. Geological Survey. 2009. Appendix—A resource/reserve classification for minerals. In Mineral commodity summaries 2009. Reston , VA : U.S. Geological Survey.
  • U.S. Geological Survey [in review]. Metals and minerals: U.S. Geological Survey Minerals Yearbook 2007: v. I, completed chapters available online. http://minerals.usgs.gov/minerals. Accessed 28 August 2009.
  • Sullivan, D. E. 2005. Metal stocks in use in the United States: U.S. Geological Survey Fact Sheet 2005-3090. http://pubs.usgs.gov/fs/2005/3090/2005-3090.pdf. Accessed 28 August 2009.