21. Illustrated catalogue of microscopes, objectives, and accessories manufactured by Bausch & Lomb Optical Co Author(s): Bausch & Lomb Optical Company, author. Publication: Rochester, N.Y. : Press of A.J. Wegman, [1892?] Subject(s): Optical DevicesMicroscopy -- instrumentation
22. 1851-1878 illustrated catalogue and price list of optical, meteorological and mathematical instruments manufactured and imported Author(s): Goldbacher, Ernest. Publication: New York : E. Goldbacher, [1879?] Subject(s): Optics and Photonics -- instrumentationEyeglassesMicroscopy -- instrumentation