The Hartman Center holds an extensive collection of over 3,000,000 items — correspondence, publications, advertisements, photographs, slides, films, books and serials — that document the history of advertising, sales, and marketing over the past two centuries. In addition to the J. Walter Thompson Company Archives, the most comprehensive historical record of any advertising agency, the Center contains the collections of other key companies and individuals in the dynamic fields of advertising, marketing and sales. Following are links to several pathfinders that describe some of our highlighted areas of focus. Check back for additions.