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Holmgren's wool, colour blindness test in which the subject matches various coloured skeins of wool, with instructions, used at the Royal (Dick) School of Veterinary Studies, University of Edinburgh, devised by Alarik Frithiof Holmgren
Holmgren, Alarik Frithiof, 1831 - 1897, Inventor
Place of use: Royal (Dick) School of Veterinary Studies
Place of use: Edinburgh, Midlothian, Scotland, Northern Europe