Exhibit 13 PROMISSORY NOTE --------------- $2,177,356.00 Oklahoma City, Oklahoma September 30, 2005 FOR VALUE RECEIVED, Jerry D. Cash and Sherrie Cash ("Borrower"), jointly and severally, promise to pay to the order of Douglas L. Lamb, or his...Lamb Douglas L • October 11th, 2005 • Crude petroleum & natural gas
FOR VALUE RECEIVED, Jerry D. Cash and Sherrie Cash ("Borrower"), jointly and severally, promise to pay to the order of Douglas L. Lamb, or his successors or assigns ("Lender"), the principal sum of Two Million One Hundred Seventy-seven Thousand, Three Hundred Fifty-six DOLLARS ($2,177,356.00) together with interest thereon at the rate of six percent (6%) per annum.
RECITALS --------14 Pledge Agreement • October 11th, 2005 • Lamb Douglas L • Crude petroleum & natural gas • Kansas
