Ad from DuPont showing the power of cellophane in the medical field instead of just the food industry, 1938 (Series I, Box 43, Folder 17, ‘Advertising tearsheets – 1938’, E.I. du Pont de Nemours & Company Advertising Department records (Accession 1803), Manuscripts and Archives Department, Hagley Museum and Library, Wilmington, DE 19807).