SIXTH AMENDED AND RESTATED CREDIT AGREEMENT among CHESAPEAKE ENERGY CORPORATION, as the Company, CHESAPEAKE EXPLORATION LIMITED PARTNERSHIP and CHESAPEAKE APPALACHIA, L.L.C. as Co-Borrowers, UNION BANK OF CALIFORNIA, N.A., as Administrative Agent, BNP...Credit Agreement • February 8th, 2006 • Chesapeake Energy Corp • Crude petroleum & natural gas • Texas
