1. The optician's manual Author(s): Brown, Christian Henry, 1857-1933, author Publication: [Philadelphia?] : [The Keystone], [1896?] Subject(s): Vision, OcularEyeglassesVision Tests
2. Color-vision and color-blindness: a practical manual for railroad surgeons Author(s): Jennings, J. Ellis (John Ellis), 1864-1906, author Publication: Philadelphia : The F.A. Davis Company, 1896 Subject(s): Color VisionColor Vision DefectsVision TestsRailroads