SEC Definition of Proved Reserves <A HREF="http://www.sec.gov/divisions/corpfin/guidance/cfactfaq.htm#P279_57537" target="_blank">http://www.sec.gov/divisions/corpfin/guidance/cfactfaq.htm#P279_57537</A> Oil & Gas Reserves, Booking Standards, & E&P Performance Market & Debt Rating Perspectives <A HREF="http://www.searchanddiscovery.net/documents/2006/06033oram/images/oram.pdf" target="_blank">http://www.searchanddiscovery.net/documents/2006/06033oram/images/oram.pdf</A> Oil and Natural Gas Reserve Prices 1982-2002: Implications for Depletion and Investment Cost <A HREF="http://web.mit.edu/ceepr/www/2003-016.pdf" target="_blank">http://web.mit.edu/ceepr/www/2003-016.pdf</A>