Related by context. Frequent words. (Click for all words.) 61 Crimson Exploration 60 Nitro Petroleum 58 Vanguard Natural Resources 57 Rand Logistics 57 BioCentric Energy Holdings 56 GreenHunter Energy 56 Geospatial Holdings 56 Monogram Energy 56 Approach Resources 55 LINN Energy 55 Royale Energy 54 ENSCO International 54 GMX Resources Inc. 54 GeoResources Inc. 53 Quasar Aerospace Industries 53 ADA ES 53 VAALCO Energy 53 Whiting Petroleum Corporation 53 Nevada Geothermal 53 XsunX Inc. 52 Copano Energy 52 Vantage Drilling Company 52 Atwood Oceanics Inc. 52 Allis Chalmers Energy 52 Concho Resources Inc. 52 STR Holdings 52 Parallel Petroleum 51 OMDA Oil 51 Gasco Energy 51 China Gengsheng Minerals 51 Harvest Natural Resources 51 National Clean Fuels 51 NYSE RDC 51 Sonoran Energy 51 EnerJex 51 Capstone Turbine Corporation 50 Crosstex Energy 50 Copano Energy LLC 50 Legacy Reserves 50 Cypress Sharpridge Investments 50 EXCO Resources Inc. 50 Rosetta Resources 50 SpongeTech Delivery Systems 50 DCP Midstream Partners 50 PetroFalcon 50 Heckmann Corporation 49 Magnum Hunter Resources 49 Manitex International 49 BPZ Energy 49 Synthesis Energy 49 Emcor Group 49 Geokinetics 49 Cheniere Energy 49 Altair Nanotechnologies Inc. 49 Ormat Technologies Inc. 49 Raser Technologies Inc. 49 Gastar Exploration 49 Megola Inc. 49 Flotek Industries Inc. 49 TexCom 49 Atwood Oceanics 49 Axial Vector Energy 49 Ardea Biosciences 49 Exterran Holdings Inc. 49 Clear Skies Solar 49 Petrosearch 49 CIRCOR International 49 Transcat 49 Sunwin International Neutraceuticals 49 Tagish Lake Gold 49 CLX Medical 49 InfraSource 49 Exterran Holdings 49 PetroSun 49 Exterran 49 MFRI 48 Whiting Petroleum 48 Sempra Generation 48 NYSE RZ 48 China BAK 48 Quanta Services 48 Bravo Venture 48 Tetra Technologies 48 BBEP 48 GeoPetro 48 Kimber Resources 48 KHD Humboldt Wedag International 48 WPCS International 48 Aura Minerals 48 Newfield Exploration Company 48 Altair Nanotechnologies 48 Dril Quip 48 Ocean Bio Chem 48 Brigham Exploration 48 TXCO 48 GPRE 48 Lenco Mobile Inc. 48 W2 Energy Inc. 48 Turbine Truck Engines 48 Neah Power Systems 48 Positron Corporation