Charcoal drawing without a master : a complete practical treatise on landscape drawing in charcoal : followed by lessons on studies after Allongé (1880)
Karl Robert, 1848-, Appleton, Elizabeth Haven, 1815-1890 · Cincinnati : Robert Clarke & Co. · leaf 86
Charcoal drawing · Landscape drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
