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Malaysia
Petronas
Indonesia
Pertamina
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United States
Alon
Amerada Hess Corporation
Anadarko Petroleum Corporation
Arbusto Energy
Chevron Corporation
Chem-Energy Corporation
ConocoPhillips
ExxonMobil
Gulf Oil
Halliburton
Kerr-McGee
Koch Industries
The Louisiana Land & Exploration Company
Shell Oil Company
Ship N Oil Corporation
Marathon Oil Corporation
Sinclair Oil
Pogo Producing
Sunoco
Vaalco Energy Inc
Van Doren Oil
Canada
Canadian Natural Resources
Enbridge
EnCana
Husky Energy
Imperial Oil
Irving Oil
Petro-Canada
North Atlantic Petroleum
Shell Canada
Suncor Energy
Syncrude
Talisman Energy
Australia
BHP Billiton
Woodside Petroleum
Santos Limited
Colombia
Ecopetrol
Finland
Neste Oil
Ire land
Maxol Group
Norway
Norsk Hydro
Statoil
Pero
Petro Peru
Brazil
Petrobras
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Qatar
Qatar Petroleum
Spain
Repsol YPF
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China
CNOOC Ltd.
PetroChina
Sinopec
India
Bharat Petroleum Corporation Limited
Cairn Energy
Essar Oil
Prize Petroleum CO.LTD
HOECL
Jubiliant Empro
JHON ENERGY
Selan Exploration Tech.Ltd.
Gujarat Oleo Chem Ltd.
Geo Global Resources.
Petronet LNG Limited
Gujarat Gas Co. Ltd.
Charottar Gas Sahkari Mandli.
Piyush Petroleum Co. Ltd
Pankaj Petroleum Co. Ltd
ONGC
Reliance Industries Limited
Indian Oil Corporation
Oil India Limited
Russia
LUKoil
YUKOS
Italy
ENI
France
Total
Japan
Teikoku Oil
Nigeria
NNPC
Venezuela
Citgo
Petróleos de Venezuela
Mexico
Petroleos Mexicanos
Greece
Elinoil Hellenic Petroleum Comopany S.A.
Austria
OMV
Singapore
SPC
New Zealand
Todd Energy
United Kingdom
BP
Royal Dutch Shell
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