[22] Rept. U. S. Geol. Survey Terr. (Hayden Survey) for 1874, Washington, 1876.
[23] Op. cit.
[24] Op. cit., pp. 377-378.
[25] Op. cit., p. 400.
[26] Op. cit., pl. xl.
[27] Mr. Van Kleeck, of Denver, has offered this ruin to the Public Parks Service for permanent preservation. It is proposed to rename it the Yucca House National Monument.
[28] Amer. Anthrop., n. s. vol. x, no. 4, pp. 596-610, 1908.
[29] Op. cit., pp. 428-429.
[30] It is premature to declare that the kivas in circular ruins do not belong to the vaulted-roofed type simply from want of observation to that effect. In Penasco Blanco and other ruins of the Chaco Canyon group, as shown in ground plans, they appear to be embedded in secular rooms. Additional studies of the architectural features of circular pueblos are desirable.
[31] The letter referring to the circular ruin near Dolores was prepared by Mr. Emerson, the discoverer of this ruin, and was transmitted to the Smithsonian Institution as part of a phase of cooperative work with the Forest Service, by Mr. Gordon Parker, superintendent of the Montezuma Forest Reserve.