1. C. Frondel, “Studies of Uranium Minerals—Uranopilite,” Am. Mineral., 37 (1952), pp. 950–969.
2. R.J. Traill, “Synthetic and X-Ray Study of Uranium Sulfate Minerals,” Am. Mineral., 37 (1952), p. 395.
3. A.D. Weeks and M.E. Thompson, ““Identification and Occurrence of Uranium and Vanadium Minerals from the Colorado Plateau,” Geol. Survey Bulletin, 1009B (1954).
4. C.L. Christ and J.R. Clark, “Crystal Chemical Studies of Some Uranyl Oxide Hydrate,” Am. Mineral., 45 (1960), pp. 1026–1061.
5. D.M. Hausen, “A Phase Study of Yellow Cake,” unpublished UCNC company report (1958).