TY - RPRT TI - Isotopic fractionation of uranium in sandstone AU - J.N. Rosholt AU - W. R. Shields AU - E. L. Garner PY - 1963 DO - 10.1126/science.139.3551.224 UR - https://pubs.usgs.gov/publication/70010842 ID - 70010842 ER -