Herbert E. Gregory:
The Gravels at Cuzco. American Journal of Science, XXXVI, No. 211, 15–29, July, 1913. Illus., map.
The La Paz Gorge. Ibid., XXXVI, 141–150, August, 1913. Illus.
A Geographical Sketch of Titicaca, the Island of the Sun. Bulletin of American Geographical Society, XLV, 561–575, August, 1913. 4 pl., map.
Geologic Sketch of Titicaca Island and Adjoining Areas. American Journal of Science, XXXVI, No. 213, 187–213, September, 1913. Illus., maps.
Geologic Reconnaissance of the Ayusbamba Fossil Beds. Ibid., XXXVII, No. 218, 125–140, February, 1914. Illus., map.
The Rodadero; A Fault Plane of Unusual Aspect. Ibid., XXXVII, No. 220, 289–298, April, 1914. Illus.
A Geologic Reconnaissance of the Cuzco Valley. Ibid., XLI, No. 241, 1–100, January, 1916. Illus., maps.
Osgood Hardy:
Cuzco and Apurimac. Bulletin of American Geographical Society, XLVI, No. 7, 500–512, 1914. Illus., map.