Women wearing four different styles of fashionable wigs. Coloured etching. https://www.rawpixel.com/image/13968085/women-wearing-four-different-styles-fashionable-wigs-coloured-etchingFree Image from public domain licenseFourteen heads showing different types of wigs. Coloured etching, 1773. https://www.rawpixel.com/image/13953801/fourteen-heads-showing-different-types-wigs-coloured-etching-1773Free Image from public domain licenseHydrotherapy: eight vignettes of different cures at Gräfenberg, Germany. Lithograph, ca. 1860. https://www.rawpixel.com/image/14005179/image-dogs-cartoon-faceFree Image from public domain licenseThe different orders and congregations of the Augustinian order, inscription of the inventors of the programme Marcantonio… https://www.rawpixel.com/image/14004166/image-cartoon-face-personFree Image from public domain license