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Biographical/Personal (0.1 linear feet) is a small series drawn from different parts of the collection containing summary information about Kellogg's life as well as some of the awards he received throughout his career.

The Correspondence series (2 linear feet; 1875-1948) documents Kellogg's many interests and the operation of the sanitarium. Correspondents in the collection include C. W. Barron, Richard E. Byrd, Mary G. Edison, Irving Fisher, Clara J. Ford, Henry Ford, Margaret LeHand, Ernest G. Liebold, Chase S. Osborn, I. P. Pavlov, Gifford Pinchot, Hazen Pingree, Sir Horace Plunckett, John D. Rockefeller, Jr., Franklin D. Roosevelt, Bernard Shaw, William Howard Taft, Ida Tarbell, Alexandra Tolstoi, Leo Tolstoi, Ilga Tolstoi, and Louis J. Van Shaick.