The Chromatic scale of colors (1890) by Marcius Willson and N.A. Calkins. Original public domain image from the Library of… https://www.rawpixel.com/image/8627644/image-art-vintage-public-domainFree Image from public domain licenseSchool and family charts, No. XX. botanical: forms of leaves, stems, roots, and flowers; botany; the classication of plants… https://www.rawpixel.com/image/2849137/free-illustration-image-botanical-vintage-school-and-family-chartsFree Image from public domain licenseSchool and family charts, No. XIX. Botanical: forms of leaves, stems, roots, and flowers (1890) print in high resolution by… https://www.rawpixel.com/image/2849264/free-illustration-image-botanical-vintageFree Image from public domain licenseSchool and family charts, No. XXI. botanical: economical uses of plants (c.1890) print in high resolution by Marcius Willson… https://www.rawpixel.com/image/2849129/free-illustration-image-vintage-flower-botanicalFree Image from public domain licenseSchool and family charts, No. XXII. Botanical: economical uses of plants (1890) print in high resolution by Marcius Willson… https://www.rawpixel.com/image/2849142/free-illustration-image-vintage-botanical-flowerFree Image from public domain license