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Appendix A <br />Yorktown Energy Partners A LP FEIN <br />410 Park Avenue, 19th Floor Phone 212-515-2100 <br />New York, NY 10022 <br />Member Shareholder <br />Officers and Directors <br />BEGIN END <br />OFFICER TITLE DATE DATE <br />AFFILIATION <br />Yorktown VI Company LP <br />General Partner 1.5%) <br />7/21/2004 <br />Bryan H Lawrence <br />Controller <br />7/21/2004 <br />W Howard Keenan Jr <br />Controller <br />7/21/2004 <br />Peter Leidel <br />Controller <br />7/21/2004 <br />Tomas LaCosta <br />Controller <br />7/21/2004 <br />Robert Si norino <br />Controller <br />7/21/2004 <br />This is a publicly traded entity <br />— with no person or entity with 10% or more ownership <br />MR -57 -17- 06/17 <br />