Container articles, catalogs, illustrations, news clippings, and reprints pertaining to Dr. Hart's research on cleanliness, physician and nursing dress, sterilization, lighting equipment, and bacteria development in the operating room environment. Photographs include scientific exhibits, operating rooms, surgical and nursing clothing, and apparatus. 'Photographs, circa 1930-1960' and 'Slides of recommended garments and protection levels provided' have been moved to Oversize Materials.