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An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge [Eng.] University Press; New York, G. P. Putnam's Sons · leaf 123
CHEMICAL EQUILIBRIA 107 … t CO bo o LogC FIG. 29.Color vision
Internet Archive · MBLWHOI Library · Public domain (published before 1931). Free to use for anything.
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