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The space-threshold of colours and its dependence upon contrast [microform] : first article
Lane, Wilmot B. (Wilmot Burkemar), b. 1871, Baird, John Wallace, 1869-1919. A case of abnormal colour-sense examined with special reference to the space-threshold of colours, Richardson, R. J. (Robert John). A case of abnormal colour-sense examined with special reference to the space-threshold of colours, Kirschmann, A. (August), 1860-1932. Additional remarks on colour- blindness · 1898 · [Toronto : s.n. · 6 pictures
Color-sense · Color-blindness · Perception des couleurs · Achromatopsie
Internet Archive · Canadiana.org · Public domain (published before 1931)
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