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Valero Energy Corp.
Oil refiners with a throughput capacity of nearly 2 million barrels per day. Operates Valero and Diamond Shamrock gas stations and convenience stores. Provides information on services, environment issues, company news, investor data, and employment opportunities. (NYSE: VLI)

Vietnam Oil and Gas Corporation
Official web site. News, business opportunities, technology, community involvement.

Williams Energy Services
Offer a range of services, including natural gas gathering, processing and liquid pipelines, petroleum products pipeline and terminalling, refineries, exploration and production, energy marketing and trading, and electricity generation .

YPF Sociedad Anonima
An integrated oil and gas company that explores, distributes and sells petroleum and related products. Multilingual site. (NYSE:YPF)

ZPL Energy LLC
Operating partner and production management of joint venture assets in Nigeria and Equatorial Guinea.

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