http://www.ogj.com/articles/uogr/print/volume-1/issue-1/fayetteville/fayetteville-groundwater-study-shows.html http://www.ogj.com/articles/print/volume-111/issue-3/drilling---production/uncertainties-threaten-natgas-development.html http://www.ogj.com/articles/print/volume-111/issue-1/special-report-forecast-review/slower-drilling-pace-likely-in-us.html http://www.ogj.com/articles/print/vol-110/issue-12/exploration-development/evaluating-production-potential-of-mature-us-oil.html http://www.ogj.com/articles/print/vol-110/issue-9a/general-interest/barclays-bhp-billiton-upbeat.html http://www.ogj.com/articles/2012/09/barclays-bhp-billiton-upbeat-on-eagle-ford-shale.html http://www.ogj.com/articles/2012/08/bhp-billiton-writes-down-us-shale-values.html http://www.ogj.com/articles/2012/07/vanguard-closes-shale-asset-deal-with-antero.html http://www.ogj.com/articles/2012/06/vanguard-natural-resources-to-buy-arkoma-basin-assets.html http://www.ogj.com/articles/2012/03/southwestern-to-slash-fayetteville-drilling-not-flow.html