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Penn Virginia Corporation is an independent oil and gas company primarily engaged in the development, exploration and production of natural gas and oil in various domestic onshore regions including East Texas, the Mid-Continent, Appalachia, Mississippi
Guttman Oil Company is a Belle Vernon, PA-based company in the Energy and Utilities sector.
Cleghorn Oil Inc is a Fitchburg, MA-based company in the Energy and Utilities sector.
Gran Tierra Energy Inc. is an international oil and gas exploration and production company headquartered in Calgary, Canada, incorporated and traded in the United States and operating in South America. The Company currently holds interests in producing and prospective properties in Colombia, Brazil and Peru. The Company strategy is focused on establishing a portfolio of drilling opportunities to exploit undeveloped reserves to grow production, as well as undertaking exploration drilling to grow future reserves.
Madagascar Oil SA is an oil company operating in Madagascar.