Fig. 6.3 Smithsonian Exhibition at the Ohio Valley Centennial Exposition, Cincinnati.
Halftone from a photograph. S. R. Koehler, "Catalogue of the Contributions of the Section of Graphic Arts to the Ohio Valley Centennial Exposition, Cincinnati, 1888." Proceedings of the U.S. National Museum 10 (Washington, 1888). Smithsonian Institution Archives. SI neg 4470.