Description: Papers of Halbert H. Thornberry (1902-99), professor of plant pathology (1938-71), including a duplicated "Study Report on a proposed International Center for Science Information Services in Phytovirology" (1961); a progress report on the phytovirology center (1964); "Thomas Jonathan Burrill's Contribution to the History of Microbiology and Plant Pathology" (1964); "Index of Plant Virus Diseases" (1966) with an explanatory letter and research materials, speeches, newspaper clippings and photographs concerning the Thomas J. Burrill Anniversary Ceremony (April 25, 1967); "The History of Plant Pathology in Illinois" (1958); three bound volumes and one folder of publication reprints; and presentations, awards, and student theses. Also included are Thornberry's MA and PhD theses and professional and personal correspondence (1934-87).