The collection includes advertising circulars, circular letters, price lists, and brochures, many of which relate to the dry cleaning business; advertisements and letters promoting dry cleaning correspondence courses; ten issues of “Widder’s Practical Dyer” (1920-1921), published by the Widder Dye & Chemical Co., Inc., Brooklyn, New York; letters to Ernst Bader offering jobs and business opportunities in reply to an advertisement he placed in a dry cleaning trade magazine; papers regarding courses in hypnotism, magic, phrenology, and psychology; papers relating to dog shows and dog breeding; papers, relating to the Plymouth Rock Squab Company of Boston, Massachusetts; and family papers.