TY  - RPRT
TI  - U-Pb ages of uraniferous opals and implications for the history of beryllium, fluorine, and uranium mineralization at Spor Mountain, Utah
AU  - K.R. Ludwig
AU  - D. A. Lindsey
AU  - R. A. Zielinski
AU  - K. R. Simmons
PY  - 1980
DO  - 10.1016/0012-821x(80)90008-4
UR  - https://pubs.usgs.gov/publication/70012396
ID  - 70012396
ER  -