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All information contained on is intended for informational and educational purposes and may only be used for these purposes. RFF retains all copyrights. Materials posted and clearly cited from other sources are the property of those sources and are used here for educational and informational purposes only. RFF is not responsible for the content. The views expressed in RFF publications, including Discussion Papers, RFF Reports, Issue Briefs, and articles in the quarterly magazine Resources, are those of contributors and should not be attributed to RFF, its directors, or its officers.

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