Letter from R.L. Roys [to Dr. A.V. Kidder, Chairman, Department of historical research, Carnegie institution of Washington] concerning work in Yucatan in the winter of 1935 ...Ralph L. Roys · First published 1935Open the Tome
The Book of Chilam Balam of ChumayelRalph L. Roys; (Introduction) J. Eric S. Thompson · First published 1967Open the Tome
Mayapan Yucatan MexicoRalph L. Roys, T. Proskouriakoff, and A. Ledyard Smith R.E.D Pollock · First published 1962Open the Tome
Report and census of the Indians of Cozumel, 1570Ralph L. Roys, France Vinton Scholes, Eleanor B. Adams · First published 1940Open the Tome
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