C.K. Cooper Upgrades Petroleum Development (PETD) to Buy, New Price Target Offers 50% Upside Aug 8, 2011 10:50AM
C.K. Cooper Downgrades Petroleum Development Corp (PETD) to Hold Aug 10, 2010 11:33AM
C.K. Cooper Upgrades Petroleum Development Corporation (PETD) to Buy May 12, 2010 10:03AM