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Professor of zoology at the University of Michigan, scientist for the Rockefeller Foundation, and scientific writer for both professional and popular publications. Correspondence, journals, manuscripts of writings, and class materials, including papers detailing his work with the United Fruit Company in Central America, 1928-1931, his later activities with the International Health Division of the Rockefeller Foundation, especially his interest in mosquito research and malaria control programs during the 1930's and 1940's, and his demographic studies of the people of the Ifalik Atoll in the South Pacific in 1953; and photographs.

The Bates papers cover the period 1913-1974 and include material relating to all phases of his career, including his research in Guatemala and Honduras with the United Fruit Company, his studies of mosquito biology and malaria control programs during the 1930's and 1940's in Albania, Egypt, Colombia, and elsewhere and his later investigations into problems of demography and human ecology. The collection includes correspondence, personal and scientific journals, miscellaneous entomological notes, manuscripts of many of his books, articles, and book reviews, copies of the scripts of his television appearances, and University of Michigan class notes. The collections also includes personal photographs and photographs relating to his scientific research.

The collection has been arranged into six series: Correspondence; University of Michigan; Journals, diaries, research; Writings; Notes/miscellaneous personal; and Photographs.

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.