1. Report of an examination of railroad men for color blindness: read before the Pennsylvania State Medical Society, May 22nd, 1879 Author(s): Keyser, Peter Dirck, 1835-1897, author Publication: [Philadelphia?] : [publisher not given], 1879 Subject(s): Color Vision Defects -- diagnosisVision ScreeningRailroads
2. Color blindness: supplemental report on ophthalmology : read before the Medical Society of the State of California, April, 1882 Author(s): Wilder, A. M. (Abraham M.), 1840-1886, author Publication: Sacramento : Day & Joy, printers, 1882 Subject(s): Color Vision Defects -- diagnosisVision Screening
