Steven and others, 1969, USGS Bull. 1261-F, p. 113.REF: CRIB #DC01912 (This record no longer exists in MRDS).Korzeb and Scott, 1992, Mineral Investigations of the Weminuche Wilderness Additions: U.S. Bureau of Mines MLA 2-92, p. 17-18. (Does not mention Holbrook).