Ceremony in the Prehistoric Southwest, Papers of the Maxwell Museum of Anthropology, 2, Albuquerque, Carlson, John B. (1987), "Romancing the Stone, or Moonshine on the Sun Dagger.", in Astronomy and Ceremony in the Prehistoric Southwest, John B. Carlson and W. James Judge, editors, Papers of the Maxwell Museum of Anthropology, 2, Albuquerque, Ford, D. (1993), "Appendix H" of The Spadefoot Toad Site: Investigations at 29SJ 629 Chaco Canyon, New Mexico Volume I, by Thomas C.Windes, Reports of the Chaco Center, Number 12, Branch of Cultural Research, Division of Anthropology, National Park Service, Santa Fe, New Mexico. Kantner, John, (2004) Ancient Puebloan Southwest Cambridge University Press, McCluskey, Stephen C., (1988) "The Probability of Noontime Shadows at Three Petroglyph Sites on Fajada Butte", Archaeoastronomy 12, Supplement to Journal for the History of Astronomy, 19, S69-S71. Palca, Joseph. "Sun dagger misses its mark." Science 244.n4912 (June 30, 1989): 1538(1). Newman, E. B., Mark, R. K., and Vivian, R. G., 1982, "Anasazi solstice marker: The use of a natural rockfall," Science, v. 217, p. 1036-1038. Sofaer, A.; Zinser, V.; Sinclair, R.M. (1979), "A Unique Solar Marking Construct: An Archeoastronomical Site in New Mexico Marks the Solstices and Equinoxes", Science, 19 October 1979, Volume 206, Number 4416 Sofaer, A.; Sinclair, R.M.; Doggett, L.E. (1982), "Lunar Markings on Fajada Butte" in Archaeoastronomy in the New World, A.F. Aveni, editor, Cambridge University Press, Sofaer, Anna, ed., Chaco Astronomy: An Ancient American Cosmology, (Santa Fe: Ocean Tree Books, 2008) Includes many papers from Sofaer's Solstice Project on the Fajada Butte "sun dagger". Sofaer, A. and Sinclair, R.M. (1987), "Astronomical Markings at Three Sites on Fajada Butte" in Astronomy and Ceremony in the Prehistoric Southwest, John B. Carlson and W. James Judge, editors, Papers of the Maxwell Museum of Anthropology, 2, Albuquerque, Sofaer, A. (2007), "The Primary Architecture of the Chacoan Culture: A Cosmological Expression" in The Architecture of Chaco Canyon, New Mexico, Stephen H. Lekson, editor, University of Utah Press, Zeilik, Michael (1985), "A Reassessment of the Fajada Butte Solar Marker," Archaeoastronomy 9, Supplement to Journal for the History of Astronomy, 16, S69-S85. External links The Solstice Project has done extensive research on the Fajada Butte Sun Dagger. Archaeological sites in New Mexico Chaco Canyon Buttes of the United States 10th century in science Landmarks in New Mexico Landforms of San Juan County, New Mexico Mountains of New Mexico History of San Juan County, New Mexico Landforms of