Figures 1 and 2, page 23. Wilhelm Greve, lithographer. Collections of the Sterling and Francine Clark Art Institute Library. Boston Public Library, digitalizing sponsor. In the public domain due to age. via https://archive.org/details/suditalienischef00jaco/page/n23/mode/1upFigures 1, 2, and 3. Page 25. Wilhelm Greve, lithographer. Collections of the Sterling and Francine Clark Art Institute Library. Boston Public Library, digitalizing sponsor. In the public domain due to age. via https://archive.org/details/suditalienischef00jaco/page/n25/mode/1upFigures 1 and 2. Page 27. Wilhelm Greve, lithographer. Collections of the Sterling and Francine Clark Art Institute Library. Boston Public Library, digitalizing sponsor. In the public domain due to age. via https://archive.org/details/suditalienischef00jaco/page/n27/mode/1up