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The majority of the Correspondence (1910-1933, 2 linear feet) series is letters written by Kraus to colleagues, with correspondence to Kraus interspersed. The letters are brief and informal in nature, discussing their families as well as professional concerns. The correspondence includes soliciting and offering opinions on equipment and supplies used in mineralogy studies, arranging to be at events, and correspondence between Kraus and his publishers. Later correspondence also includes letters related to administering his departments at the University of Michigan and to his church.

The Other Activities and Interests (1904-1970, 2.25 linear feet) is comprised of three subseries: Biographical, University of Michigan, and Other Organizations. Biographical provides an overview of his life, including articles, photographs and his diplomas. University of Michigan documents his career as a mineralogist and administrator, including his tenure as Dean of the Summer Session and his involvement with the Research Club. The subseries also includes speeches, articles, and a book written by Kraus, and his appointment books for most of his career that record his meetings and phone calls with colleagues and events he attended. The final subseries, Other Organizations, documents his religious involvement with the Ann Arbor First Methodist Episcopal Church and the Wesley Society and his involvement with the honors society Phi Kappa Phi. It also includes a history of the Mineralogical Society of America, of which he was a founding member and the first president.