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The YERKES ADDITION was donated to Yale University Library by Roberta Yerkes Blanshard in May 1985. It consists of three boxes of correspondence and other material of Roberta Yerkes Blanshard, concerning Robert M. Yerkes and the Yerkes Regional Primate Research Center at Emory University in Atlanta, Georgia. The papers are divided into four series and the material spans the dates 1925-1985.