|
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| See also Schweitzer (1944, p. 80-82), Berkholz (1962, locality 18), Strong (1971, p. 53) and Mitchell (1986, p. 54). McMackin (1981, p. 1868-1876). Lewis (1942, p. 116, 117) and Hagar, D., (1946 p. 8-9) for early reports |