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Researches in colour vision and the trichromatic theory (1913)
Abney, William de Wiveleslie, Sir, 1843-1920 · London : Longmans, Green · leaf 115
THE MEASUREMENT OF LUMINOSITY 95 Fig. 32.Color Perception · Color blindness · Color vision
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.
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