E.I. du Pont de Nemours & Company’s R. & H. Chemicals Department manufactured and sold peroxides, cyanide of sodium, formaldehyde, trychloretheline, tin oxide, and polyvinyl alcohol. The department was formed in 1933 as a result of the 1930 acquisition of the Roessler & Hasslacher Chemical Company, which operated a plant in Niagara Falls, New York. The records primarily consist of reports on experimentations with various insecticides, pesticides, preservatives, and other forms of pest and disease-control applied to the farming and agricultural industries.