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| Keywords: US Coalbed Methane Prod.png coalbed methane production 1989-2011 ; steady increase from 1990 to 2007/2008 and decline from 2008 to 2012 gaz de couche aux États-Unis ; augmentation régulière de 1990 à 2007-2008 et déclin de 2008 à 2012 2013-10-10 21 19 27 http //www eia gov/dnav/ng/ng_prod_coalbed_s1_a htm US Energy Information Administration US Coalbed Methane Production svg PD-USGov Coalbed methane | ||||
