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Moderate wear. With Phoresy by North and Central American Pseudoscorpions by William B Muchmore, Plant Community Development in Bergen Swamp by Clarence W Gehris, Studies of the Plants of the Genesee Country (Western New York State)- The Aquatic Flora of Conesus Lake, the Ferns of Livingston County, Algae of Conesus Lake, Livingston County (initial report), some aspects of the Ecology of Orleans County NY.