Statement of Changes in Beneficial Ownership
April 19, 2012
Annual Report 2011
April 16, 2012
Top 100 Stockholders as of March 31, 2012
April 12, 2012
Public Ownership Report as of March 31, 2012
Statement of Changes in Beneficial Ownership (SEC Form 23B)
April 11, 2012
April 10, 2012
Report on the Number of Shareholders as of March 31, 2012
March 14, 2012
March 8, 2012
Report on the number of Shareholders as of Feb 29, 2012
March 7, 2012
February 7, 2012
Certification on Compliance with Manual on Corporate Governance
Certification on Petroleum Service Contracts with DOE
Computation of Public Ownership Report as of December 31, 2011
Report on the Nnumber of Shareholders as of December 31, 2011
Certification on attendance of members of Board of Directors for the year 2011
Statement of Changes in Beneficial Ownership_(SEC_Form_23B)
Top 100 Stockholders as of December 31, 2011