Oil and gas - oil and gas producers companies

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EnCana Corporation Advantage Oil & Gas Ltd.
Talisman Energy Inc. Calvalley Petroleum Inc.
TriOil Resources Ltd. Nexen Inc.
Greenfields Petroleum Corporation Sagres Energy Inc.
Gran Tierra Energy Inc. Arsenal Energy Inc.
Arcan Resources Ltd. Celtic Exploration Ltd.
Petro Vista Energy Corp. Enerplus Corporation
Dundee Energy Limited Canadian Natural Resources Limited
Crew Energy Inc. Vecta Energy Corporation
Greenlight Resources Inc. Cenovus Energy Inc.
Sahara Energy Ltd. Gran Tierra Exchangeco Inc.
Athabasca Oil Sands Corp. Bolivar Energy Corp.
Primary Petroleum Corporation Equal Energy Ltd.
Parallel Energy Trust Angle Energy Inc.
Twin Butte Energy Ltd. Canadian Oil Sands Limited
DeeThree Exploration Ltd. PetroBakken Energy Ltd.
Bonavista Energy Corporation Hermes Financial Inc.
Guide Exploration Ltd. Athabasca Oil Corporation