[X-21] Castillo, in Id., 2da época, tom. iv., pp. 107-8.
[X-22] Berlandier and Thovel, Diario, p. 25.
[X-23] Soc. Mex. Geog., Boletin, 2da época, tom. iii., pp. 278-9, preceded by an account quoted from Torquemada.
[X-24] Lyon's Journal, vol. i., pp. 225-44.
[X-25] Esparza, Informe, pp. 56-8. The same report also published in 1843, in the Museo Mex., tom. i., p. 185, et seq., with some remarks by the editor, who saw the ruins in 1831. The article also includes a quotation from Frejes, Conquista de Zacatecas, an attempt to clear up the origin and history of the ruined city, and a plate reduced from Nebel.
[X-26] Burkart, Aufenthalt, tom. ii., pp. 97-105.
[X-27] Viaje. His Mexican trip began in 1831, Soc. Géog., Bulletin, tom. xv., No. 95, p. 141, and Burkart met him in Zacatecas some time before 1834.
[X-28] Other accounts containing no additional information, and made up, except one or two, from the authorities already mentioned:—Gil, in Soc. Mex. Geog., Boletin, tom. viii., pp. 441-2; Mayer's Mex. as it Was, pp. 240-6; Id., Mex. Aztec, etc., vol. ii., pp. 317-23, Lyon's description and Nebel's plate; Id., in Schoolcraft's Arch., vol. vi., p. 581; Bradford's Amer. Antiq., pp. 90-5; Mühlenpfordt, Mejico, tom. ii., pt. ii., p. 492; Wappäus, Geog. u. Stat., p. 204; Frost's Pict. Hist. Mex., pp. 58-66; Id., Great Cities, pp. 304-12, cuts; Rio, Beschreib. einer alt. Stadt, appendix, pp. 70-5.
[X-29] Tello, Fragmentos, in Icazbalceta, Col. de Doc., tom. ii., p. 344.
[X-30] Soc. Mex. Geog., Boletin, tom. viii., pp. 441-2, 496; Frejes, in Museo Mex., tom. i., pp. 186-9; Lyon's Journal, vol. i., p. 243.