Rochester: Bausch & Lomb Optical Co., ]. 12mo., 34,  pp.,  pp. supplement tipped-in, illustrated from b&w photographs. Decorative paper wrappers. Ink date on the front wrapper. Fine. Item #53177
The first section describes various lenses and their uses; the second section provides technical specifications for a variety of lens configurations and focal lengths, shutters, etc.; prices included. The 4 pp. supplement brings the prices to March, 1920.