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Colour : an elementary manual for students (1907)
Church, A. H. (Arthur Herbert), 1834-1915 · London : Cassell · leaf 8
The Three Colour Sensations. Rlastrated/ JFig. 74 (see page 69.) \'ini>vN.'BTaaiaX>'fl<2mI.i^hihColor
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
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