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\bibitem{Bove+OBrien} Bove, M. C., \& O{\textquoteright}Brien, J. J. \textit{PDO Modification of U.S ENSO Climate Impacts}. COAPS Technical Report 00-3, 103 pp., Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, 32306-2840.

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