TY - RPRT TI - Selenium isotope ratios as indicators of selenium sources and oxyanion reduction AU - T.M. Johnson AU - M.J. Herbel AU - T.D. Bullen AU - P.T. Zawislanski PY - 1999 DO - 10.1016/s0016-7037(99)00279-3 UR - https://pubs.usgs.gov/publication/70021217 ID - 70021217 ER -