R. H. Engelke Productores de petróleo y gas Ram Energy Ramshorn Investments Inc. Rand Energy Co. Randolph Enterprises LC. Ranger Oil Ltd. Rebel Drilling Co. LP. Red Planet Mining LP. Redeco Energy Inc. Redfish Leaseholds Inc. Redwood Energy Ltd. Refuge Exploration Co. Inc. Reliance Insurance Remington Oil & Gas Corp. Repsol YPF Resolute Natural Resources Resource Strategies LLC. Rex Energy Limited Partnership Rialto Energy Inc. Ricks Exploration Inc. Ridgewood Energy Corp. Rim Oil & Gas Rimel y Rimel Rio Grande Drilling Co. River Gas Corp. Riverstone Holdings LLC. RMS Monte Christo LLC. Roch SA. Rock Ridge Oil & Gas Inc. Rockford Energy Partners LLC. Rocky Mountain Gas Roda Drilling Co. Roemer Oil Co. Roff Resources LLC. Rooster Petroleum LLC. Rosetta Resources Inc. Rothchild Oil & Gas Rowan Cos. Inc. Royal Gold Inc. RP UFO International LLC. RSW Joint Venture Rushlake Hotels (USA) Inc. Rutherford Oil Corp. Ruwco Oil and Gas Corp. |
Rag American Coal Holdings Inc. Rampart Energy Co. Rancher Energy Corp. Randall y Dewey Range Resources Corp. Reading & Bates Development Co. Recluse Methane LLC. Red River Energy Redexco Company Ventures Ltd. Redstone Resources Inc. Reef Energy Co. Regal Petroleum PLC. Reliant Energy Wholesale Group Renaissance Energy Ltd. Reserve Petroleum U.S.A. Resource Investors Management Co. Reunion Energy RF Energy Corp. Richland Petroleum Corp. Ridgelake Energy Rife Resources Ltd. Rimco Exploration Rio Alto Exploration Ltd. Río Vista Riverbend Production LP. RKI Exploración y Producción Roc Oil Co. Ltd. Rock Energy Partners Rock Well Petroleum Inc. Rockport Energy Corp. Rocky Point Oil Inc. Rodinia Oil Corp. Roemer-Swanson Energy Corp. Roochester Energy Corp. Rose Energy Corp. Rosewood Resources Inc. Rothfelder & Falick LLP. Royal Bank of Canada Royston, Rayzor, Vickery and Will RSEC LLC. RTM Gas Company Rusia Petroleum Rutherford-Moran Oil Corp. Ryan, Ryan, Johnson, McCaghey |