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The physiology of vision with special reference to colour blindness (1920)
Edridge-Green, Frederick William, 1863- · London, G. Bell and sons · leaf 145
PHYSIOLOGY OF VISION 130 a b c d Fig. 13. B^ B B, … Fjg. 14,Color vision · Vision · Color blindness · Refraction · Ophthalmology
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
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