XOM Is Now the Largest NG Producer in the US by a Wide Margin images.investorshub.advfn.com/images/uploads/2010/7/9/uwcivUS_NG_ranking_src_XOM_7-10.png Source: http://phx.corporate-ir.net/External.File?item=UGFyZW50SUQ9MzE4MzgyOHxDaGlsZElEPTM4ODQ1MnxUeXBlPTI=&t=1