Legal full-text edition
The colour-sense
Color visionColorPsychological aspects of ColorPsychological aspectsColor blindnessColour visionContrast sensitivity (Vision)
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Public-domain status shown for US. Open Library Read API reports full access; scan publication year 1879 is within the US public-domain cutoff
Public-domain status shown for US. Open Library Read API reports full access; scan publication year 1879 is within the US public-domain cutoff