Sacred Mysteries Among the Mayas and the Quiches, 11,500 Years Ago

Mysteries of Washington City, during Several Months of the Session of the 28th Congress

Ancient Pagan and Modern Christian Symbolism With an Essay on Baal Worship, on the Assyrian Sacred "Grove," and Other Allied Symbols

Vestiges of the Mayas or, Facts Tending to Prove That Communications and Intimate Relations Must Have Existed, in Very Remote Times, Between the Inhabitants of Mayab and Those of Asia and Africa

The Mayas, the Sources of Their History Dr. Le Plongeon in Yucatan, His Account of Discoveries

The Sacred Formulas of the Cherokees Seventh Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1885-1886, Government Printing Office, Washington, 1891, pages 301-398