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Credit
De la perceptivité normale et surtout anormale de l'oeil pour les couleurs : spécialement de l'achromatopsie ou cécité des couleurs / par Émile Goubert. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.