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Professional Activities.  Phi Beta Kappa Visiting Scholar. (Box 14, Folder 46)
Professional Activities. Harlem School of the Arts. (Box 80, Folder 4)
Professional Activities and Professional Correspondence (general). American Psychological Association, Committee on Ethical Standards. (Box 4, Folder 3)
Professional Activities.  1st International Congress on Plant Pathology, London. (Box 14, Folder 42)
Primary Productivity and Benthic Marine Algae of the Antarctic and the Subantarctic: Folio 10
Post-Oil Urbanism: Barry Lehrman, Dec. 2010
Plat book of the city of Saint Paul, Minn., and suburbs : from official records, private plans and actual surveys.
Plant Pathology Seminar. Plant pathology seminar abstracts. (Box 5, Folder 15)
Plant Pathology Department University of Minnesota and United States Department of Agriculture. Annual Report of the Progress of Barberry Eradication. (Box 10, Folder 34)
Photographs, Postcards, Clippings. Newspaper Clippings. (Box 9, Folder 26)