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SW: →External links: added studies
* Matthew L. Wald, [http://www.nytimes.com/2007/06/21/business/21coal.html?_r=1&oref=slogin "Science panel finds fault with estimates of coal supply,"] New York Times, 6/21/07
* [http://www.nma.org/pdf/members/coal_producer_survey2007.pdf 2007 Coal Producers Survey,] National Mining Association, 2008
* Mikael Höök, Kjell Aleklett, [http://dx.doi.org/10.1016/j.coal.2009.03.002 "Historical trends in American coal production and a possible future outlook,"] International Journal of Coal Geology, Volume 78, Issue 3, May 1, 2009, pp 201-216* Robert C. Milici, [http://www.springerlink.com/content/11452627444p97u2/ "Coal-to-Liquids: Potential Impact on U.S. Coal Reserves,"] Natural Resources Research, Volume 18, Number 2, 85-94, DOI: 10.1007/s11053-009-9093-1
[[Category: Coal mining]]
