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Administaff Services, L.P.
Aetna Foundation, Inc.
AIG
American Express Foundation
Apache Corporation
Baker Hughes Foundation
Bank of America
BP Foundation, Inc.
Cemex Foundation, Inc.
Chevron Employees
Citgo Petroleum Corporation
Colonial Group, Inc.
Comerica Incorporated
Computer Associates
Computer Sciences Corporation
ConocoPhillips
Cooper Industries
Dorflinger Foundation
Duke Energy Foundation
DuPont Powder Coatings
EOG Resources
ERS – Enhanced Revenue Solutions
Equistar Chemicals, LP
ExxonMobil Foundation
FMC Tecnologies Inc
Gap Giving Program
GlaxoSmithKline Foundation
Global Impact
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Global Santa Fe Corporate Services
Harris and Eliza Kempner Fund
Hewlett-Packard Company
The Houston Exploration Company
Houston Gold
ING
The J.P. Morgan Chase Foundation
Jefferies & Company, Inc.
The Lubrizol Corporation
Lyondell Petrochemical Company
Merrill Lynch
Mobil Foundation, Inc.
Murphy Oil USA, Inc.
Newfield Exploration Company
Occidental Permian Ltd.
Oiltanking Houston, L.P.
Pella Rolscreen Foundation
Penn Virginia Corporation
Pogo Producing Company
Siemens
Symantec
Tenet Healthcare Foundation
TurboCare
Verizon Foundation
Wachovia Foundation
Washington Mutual Inc.
Waste Management Service Center
The Williams Companies, Inc.
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