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This volume is the thirteenth of the topically-oriented series of phase diagram compilations and the eighth to appear since the National Institute of Standards and TEchnology (NIST) and the American Ceramic Society (ACerS) embarked on a jointly-sponsored expanded Ceramic Phase Equilibria Program. This volume, Volume XIII includes only oxide systems, published primarily from the early 1980's through 1998 and complements earlier volumes on oxide systems.