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Colour-blindness and colour-perception (1909)
Edridge-Green, Frederick William, 1863-, University of Leeds. Library · London : Kegan Paul, Trench, Trübner · leaf 141
Fig- 17a. Dictiromic. Fis. k;. Fig. l(5a. Tetrachfomic. … Fig. 20a. Fig. 20. Dichromic.Colour vision defects · Colour perception
Internet Archive · University of Leeds Library · Public domain (published before 1931). Free to use for anything.
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