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Climate response to orbital forcing across the Oligocene-Miocene boundary
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2001. Climate response to orbital forcing across the Oligocene-Miocene boundary. Science. 292:274-278.
Drought-induced shift of a forest-woodland ecotone: Rapid landscape response to climate variation
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1998. Drought-induced shift of a forest-woodland ecotone: Rapid landscape response to climate variation. Proceedings of the National Academy of Sciences of the United States of America. 95:14839-14842.