units include: the Western United
States (Western), Southern United States (Southern), Alaska, Canada and
International. We conduct exploration and development activities in each of our
geographical segments; however, all of our estimated proved reserves and
producing properties are located in North America. While discoveries of oil and
gas have been made in our International business unit, no proven reserves have
been recorded to date. At December 31, 2006, approximately 84% of our
estimated proved oil and gas reserves were in the United States and
approximately 16% were in Canada. Forests total estimated proved reserves as
of December 31, 2006...
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