Maler, Teobert. 1901. Researches in the central portion of the Usumatsintla valley. Memoirs Peabody Mus., II, No. 1, pp. 9-75, Cambridge.
—— 1903. Researches in the central portion of the Usumatsintla valley. [Continued.] Ibid., No. 2, pp. 83-208.
—— 1908 a. Explorations of the upper Usumatsintla and adjacent region. Ibid., IV, No. 1, pp. 1-51.
Maler, Teobert. 1908 b. Explorations in the Department of Peten, Guatemala, and adjacent region. Ibid., No. 2, pp. 55-127.
—— 1910. Explorations in the Department of Peten, Guatemala, and adjacent region. [Continued.] Ibid., No. 3, pp. 131-170.
—— 1911. Explorations in the Department of Peten, Guatemala. Tikal. Ibid., V, No. 1, pp. 3-91, pls. 1-26.
Maudslay, A. P. 1889-1902. Biologia Centrali-Americana, or contributions to the knowledge of the flora and fauna of Mexico and Central America. Archæology. 4 vols. of text and plates. London.
Morley, S. G. 1910 b. Correlation of Maya and Christian chronology. Amer. Journ. Archeol., 2d ser., XIV, pp. 193-204, Norwood, Mass.
—— 1911. The historical value of the Books of Chilan Balam. Ibid., XV, pp. 195-214.