File:James Sowerby - A new elucidation of colours, original, prismatic, and material.pdf - Wikimedia Commons
File:James Sowerby - A new elucidation of colours, original, prismatic, and material.pdf - Wikimedia Commons
commons.wikimedia.org
File:James Sowerby - A new elucidation of colours, original, prismatic, and material.pdf - Wikimedia Commons
