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Blue and Red Light, or, Light and its Rays as Medicine (1877)
Blue and red light: or, Light and its rays as medicine; showing that light is the original and sole source of life, as it is the source of all the physical and vital forces in nature; and that light is nature’s own and only remedy for disease … together with a chapter on light in the vegetable kingdom by Pancoast, S. (Seth), 1823-1889. The First Books Ever Written on Blue and Red Light Therapy See Article here
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