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A note on color for teachers of elementary schools (1912)
Van Helden, Caroline West · Springfield, Mass. : Milton Bradley Co. · leaf 32
SCALE OF HUES Keyboard for Developing Color Harmonies Shade 1 Shade 2 Tint 2 Tint 1 … PlateColor
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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