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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 8
Fig. 1 10 6a 6b Dichromic with shortened violet oa Tricliromic with shortened redColour vision defects · Colour perception
Internet Archive · University of Leeds Library · Public domain (published before 1931). Free to use for anything.
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