A new series of Berlin wools for the scientific detection of subnormal color-perception (color-blindness) Oliver, Charles A. (Charles Augustus), 1853-1911 author. Color Vision Defects -- diagnosis Color Perception Tests Wool [Philadelphia?] : [publisher not identified], [1886?] Text 1 folded sheet (4 pages) nlm:nlmuid-101729836-bk 101729836 http://resource.nlm.nih.gov/101729836 OCLC: 1044506217 English The National Library of Medicine believes this item to be in the public domain. https://creativecommons.org/publicdomain/mark/1.0