References

Coal: References
  1. U.S. Department of Energy, www.doe.gov
  2. U.S. Department of Energy, Office of Fossil Energy, www.fe.doe.gov
  3. U.S. Department of Energy, Energy Information Administration, www.eia.doe.gov
  4. American Coal Foundation, www.teachcoal.org
  5. Centre for Energy and Economic Development, www.ceednet.org
  6. Mine-Engineer.com, www.mine-engineer.com
  7. Tennessee Valley Authority, www.tva.org
  8. National Mining Association, www.nma.org