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11 sites listed in this category.

U.S. Energy Development Corporation    Gas & Oil Producer & Operator. Established in 1980. Texas, Louisiana, Ohio, New York, Pennsyvania, Maryland, West Virginia, Michigan and Ontario. url: www.usenergydevcorp.com Ultra Petroleum Corp.    Natural gas exploration and production company. Ultra Petroleum controls more than 275,000 gross acres (200,000 net) in the play in the Green River Basin in Wyoming. url: www.ultrapetroleum.com Unit Corporation    Diversified energy company involved in the exploration and production of oil and natural gas through its subsidiary, Unit Petroleum Company, and the contract drilling of onshore oil and natural gas wells through its subsidiary, Unit Drilling Company. url: www.unitcorp.com United Heritage Corporation    United Heritage Corporation is an oil and gas exploration and production company with 10,500 leasehold acres in the Val Verde Basin of south Texas. url: www.unitedheritagecorp.com UNOCAL    UNOCAL is one of the world's leading energy resource and project development companies. UNOCAL produces and sells a broad array of essential energy resources, fertilizers and specialty minerals, and develops major energy projects. url: www.unocal.com USX-Marathon Oil    Marathon Oil is an internationally recognized company with upstream and downstream operations throughout the world. url: www.marathon.com Vaalco Energy, Inc.    Vaalco is a Houston based energy company principally engaged in the acquisition, exploration and production of oil and natural gas with domestic and international prospects. url: www.vaalco.com Veba Oel    Ranging beyond its home base in Germany, VEBA is engaged in oil & gas exploration & production in 13 countries worldwide and has refining & marketing operations across Europe. The company has proved reserves of 473 million barrels of oil equivalent. url: www.vebaoel.de Wiser Oil Company    The Wiser Oil Company is an independent energy company engaged in the exploration, production and acquisition of crude oil and natural gas reserves primarily in the United States and Canada. url: www.wiseroil.com Woodside Petroleum    Woodside Petroleum is an Australian resource development company with extensive Exploration and development interests. Woodside markets a complete range of oil & gas products in Australia and internationally. url: www.woodside.com.au YPF Exploration    YPF is an international energy company with operations in Latin America, Indonesia and the U.S. With upstream and downstream facilities, YPF maintains a dominant position in Argentina. url: www.ypf.com