Art in Shell of the Ancient Americans Second annual report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, pages 179-306

Ancient America, in Notes on American Archaeology

The Story of Extinct Civilizations of the West

La cruz en América (Arqueología Argentina)

Travels Amongst American Indians, Their Ancient Earthworks and Temples Including a Journey in Guatemala, Mexico and Yucatan, and a Visit to the Ruins of Patinamit, Utatlan, Palenque and Uxmal