EXHIBIT 4.19 Sixth Amendment to Agreement and Certificate of Limited Partnership of Geodyne Energy Income Limited Partnership II-B This Sixth Amendment to Agreement and Certificate of Limited Partnership of Geodyne Energy Income Limited Partnership...Agreement and Certificate of Limited Partnership • March 29th, 2006 • Geodyne Energy Income LTD Partnership Ii-E • Asset-backed securities
Exhibit 4.81 Sixth Amendment to Agreement and Certificate of Limited Partnership of Geodyne Energy Income Limited Partnership II-H This Sixth Amendment to Agreement and Certificate of Limited Partnership of Geodyne Energy Income Limited Partnership...Agreement and Certificate of Limited Partnership • March 19th, 2004 • Geodyne Energy Income LTD Partnership Ii-H • Crude petroleum & natural gas