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Diaz is an oil and gas exploration and development company with land holdings and production in Canada and the United States. Diaz Resources Ltd. principal business is the exploration for and marketing of natural gas with the majority of the Company's revenue being generated from gas production in Alberta and Texas. Diaz Resources Ltd. also explores for hydrocarbons in Saskatchewan. Diaz Resources has exploration operations in the Deep Wilcox Trend of Texas and in the Harmattan area of Alberta. Diaz Resources Ltd. is also involved in a shallow gas infill program at the Enchant and Retlaw areas of Alberta. In 2006 Diaz Resources Ltd. reported proved and probable reserves of 27.8 billion cu. ft. of natural gas and 437,000 barrels of oil and condensate. Diaz Resources Ltd. current focus is on the development of a heavy oil pool near Lloydminster, Alberta, and oil exploration in Alberta and Saskatchewan.

Dolphin was founded in 1965 under the name A/S Aker Drilling and was acquired by Fred.Olsen in 1976. Dolphin is one of the pioneers in the Norwegian oil industry. Since Dolphin A/S was established in 1965 Dolphin A/S has acquired a broad and deep experience in the operation of drilling units on the Norwegian Continental Shelf. Dolphin A/S, a subsidiary of Fred.Olsen Energy, provides snubbing, hydraulic workover, and offshore drilling services to oil and gas exploration and production customers operating in the North Sea and off the coasts of Brazil and Trinidad. Dolphin, together with sister company Dolphin Drilling operates a fleet of eight semi-submersible drilling rigs, one deepwater drill ship, and a semisubmersible accommodation unit. Dolphin A/S customers have included Shell, Phillips Petroleum UK, and Smedvig.

Doyon, Limited, the doyenne of a Native American-owned corporations, is the largest private landowner in Alaska, controlling 12.5 million acres. Doyon, Limited has five businesses with diversified interests, including tourism (Doyon Tourism), oil exploration services (Doyon Drilling), catering, security services, and facility maintenance (Doyon Universal Services), commercial property management (Doyon Properties), and natural resource management (Doyon Lands and Natural Resources). The Doyon Foundation promotes health, education, and economic development of native Alaskans.

Dragon Oil plc is an independent oil development and production company, registered in Ireland and listed under a dual primary listing on the London and Irish Stock Exchanges. Approximately 52% of the Company’s equity is held by the Emirates National Oil Company (ENOC) L.L.C. (“ENOC”), a company owned by the Government of Dubai. Dragon Oil is headquartered in Dubai and its principal development and production activity is the development of its asset in the Cheleken Contract Area, offshore Turkmenistan by a Group subsidiary, Dragon Oil (Turkmenistan) Limited. Dragon Oil had proved and probable oil reserves at 30 June 2008 of 645 million barrels and 3.2 trillion cuft of gas resources. The company reports recoverable proved and probable reserves of 645 million barrels of oil and condensate in the Cheleken area. Dragon Oil PLC is a subsidiary of the Emirates National Oil Company. Dragon Oil PLC owns a 52% stake in Dragon Oil, but in 2009 bid to acquire 100%. Shareholders rebuffed the offer.

Dune Energy, Inc. (DNE), an independent exploration and development company incorporated in Delaware, has operations focused along the Louisiana and Texas Gulf Coasts. Dune’s strategy is to grow organically through low-risk exploitation and development and higher risk exploration of its existing properties and acreage. This will be supplemented with opportunistic acquisition of underdeveloped properties that complement Dune’s existing portfolio. The oil and gas exploration and production independent has leases on 100,000 gross acres across 23 producing oil and natural gas fields along the Texas and Louisiana Gulf Coast. In 2008 Dune Energy reported proved reserves of 8.2 million barrels of oil and 83.8 billion cu. ft. of natural gas. Dune Energy, Inc. has a more than two-year current drilling inventory for its properties along the Gulf Coast. Swiss bank UBS owns 35% of the company; Russian gas company ITERA's Tierra Holdings BV unit, 33%.

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