TY  - RPRT
TI  - Determination of the oxidation state of uranium in apatite and phosphorite deposits
AU  - R. S. Clarke
AU  - Z. S. Altschuler
PY  - 1958
DO  - 10.1016/0016-7037(58)90044-9
UR  - https://pubs.usgs.gov/publication/70010665
ID  - 70010665
ER  -