http://www.ogj.com/articles/print/volume-111/issue-5b/regular-features/ogj-newsletter.html http://www.ogj.com/articles/2013/05/us-drilling-rig-count-unchanged-at-1-769.html http://www.ogj.com/articles/print/volume-111/issue-5a/regular-features/ogj-newsletter.html http://www.ogj.com/articles/2013/05/us-drilling-rig-count-up-5-units-to-1-769.html http://www.ogj.com/articles/2013/05/us-drilling-rig-count-gains-10-units-to-1-764.html http://www.ogj.com/articles/2013/04/us-drilling-rig-count-down-4-units-to-1-754.html http://www.ogj.com/articles/2013/04/us-drilling-rig-count-down-13-units-to-1-758.html http://www.ogj.com/articles/2013/04/land-based--oil-drilling-drive-up-us-rig-count-to-1-771.html http://www.ogj.com/articles/print/volume-111/issue-4a/regular-features/ogj-newsletter.html http://www.ogj.com/articles/2013/04/us-rig-count-drops-10-units-to-1-738--canada-down-40-to-206.html