RT Journal Article SR Electronic T1 Theodore William Richards and the Atomic Weight Problem JF Science JO Science FD American Association for the Advancement of Science SP 647 OP 651 DO 10.1126/science.164.3880.647 VO 164 IS 3880 A1 Ihde, Aaron J. YR 1969 UL http://science.sciencemag.org/content/164/3880/647.abstract AB