Variations in 238U/235U in uranium ore deposits: Isotopic signatures of the U reduction process? Bopp, C. J. ; Lundstrom, C. C. ; Johnson, T. M. ; Glessner, J. J. G. Abstract Publication: Geology Pub Date: July 2009 DOI: 10.1130/G25550A.1 Bibcode: 2009Geo....37..611B