TY - RPRT TI - Selenium, iron, and chromium stable isotope ratio measurements by the double isotope spike TIMS method AU - Thomas M. Johnson AU - Thomas D. Bullen PY - 2004 DO - 10.1016/b978-044451114-0/50031-4 UR - https://pubs.usgs.gov/publication/70199407 ID - 70199407 ER -