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Correspondence, manuscripts, addresses, documents and printed materials. Correspondents include: Milton Friedman, Samuel S. Wilks, Nathan Pusey, William Proxmire, Helen M. Walker, Ray Lyman Wilbur, Alfred Cowles, 3d and Ragnar Frisch. The papers also include biographical, teaching and research materials; publications and drafts of articles and books including his study, "The Teaching of Statistics," and materials on the concept of "Hotelling's Generalized T."