 It also houses an exceptional photograph collection of over 400,000 images, 350 oral history interviews, over 40,000 collective bargaining agreements, over 250,000 pamphlets and union constitutions, and other labor relater material.The Center is the designated repository for papers of key individuals and organizations prominent in the history of labor-management relations.In May 1996, the center was renamed to honor Theodore W. Kheel, distinguished lawyer, arbitrator, mediator, and public figure and his wife, Ann Sunstein Kheel.