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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.

Physicist, University of Michigan professor, dean of the graduate school; correspondence, writings, speeches, organizational files, audio-visual materials.

Although the Ralph A. Sawyer collection includes materials relating to all phases of his career, beginning with his studies at the University of Chicago in 1918-1919, the strength of the files are for those activities outside of the University of Michigan, notably his work with the U.S. Navy laboratories, Joint Task Force One, the American Institute of Physics, and the Optical Society of America. Files dealing with his University of Michigan activities are less complete as these materials will be found with the records of those units which Sawyer headed.