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The Jacob Ellsworth Reighard collection contains the papers and photographs of a noted professor of zoology, including his research, class lectures and correspondence. Jacob Reighard was responsible for the development of modern zoological teaching and research at the University of Michigan and a national leader in the field of zoology.

The Jacob Reighard collection consists of thirteen feet of correspondence, speeches, lectures, drafts of writings, University of Michigan lecture and course materials, and files of research materials and field notes. The collection covers the period of 1887 to 1942. The collection has been organized into four series; Correspondence, Writings and Speeches, University Lecture and Course Materials, and Research Materials and Field Notes. This finding aid also contains a selective inventory of correspondents found within the Reighard papers.

Professor of biology and dean of the Horace H. Rackham School of Graduate Studies; contain correspondence and other papers concerning his professional activities; and biographical sketch.

The Okkelberg collection is comprised of correspondence dating from 1910 to 1950, the approximate dates of his tenure at the University of Michigan. The correspondence is arranged chronologically and relates primarily to his career as a professor of zoology and to his work as an University of Michigan assistant and associate dean of the graduate school. Okkelberg corresponded with colleagues and administrators, within and outside the University of Michigan community. Correspondents include: Marion L. Burton, Oct. 1920, Robert M. Lovett, Sept. 1926, Jacob E. Reighard, July 1913, and Alexander G. Ruthven, June 1914 and April 1918.