The space-threshold of colours and its dependence upon contrast [microform] : first article (1898)
Lane, Wilmot B. (Wilmot Burkemar), b. 1871, Baird, John Wallace, 1869-1919, Richardson, R. J. (Robert John), Kirschmann, A. (August), 1860-1932 · [Toronto : s.n. · leaf 97
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Color-sense · Color-blindness · Perception des couleurs · Achromatopsie
Internet Archive · Canadiana.org · Public domain (published before 1931). Free to use for anything.
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