RT Journal Article SR Electronic T1 Ultimate disintegration products of the radioactive elements; Part II, Disintegration products of uranium JF American Journal of Science JO Am J Sci FD American Journal of Science SP 78 OP 88 DO 10.2475/ajs.s4-23.134.78 VO s4-23 IS 134 A1 Boltwood, B. B. YR 1907 UL http://www.ajsonline.org/content/s4-23/134/78.abstract AB