The Dentists' Supply Company of New York (estab. 1899)
Small book detailing the origins of the concept of tooth form developed by Doctors Gysi & Clapp, American researchers working in the early 1900s. The book describes and illustrates the moulds and shades of 'Trubyte' artificial teeth and instructs in how to 'set them up' for best results. Book was designed as an advertising aid.