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Color-blindness [electronic resource] : its dangers and its detection (1879)
Jeffries, B. Joy (Benjamin Joy), 1833-1915 · Boston : Houghton, Osgood ; London : Trübner · leaf 89
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59 ITS DANGERS AND ITS DETECTION. TABLE I. … EXPLANATION. — The star (*) denotes those who ware color-blind.Color Vision Defects
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.
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