RT Journal Article SR Electronic T1 THE SIXTH NATIONAL EXPOSITION OF CHEMICAL INDUSTRIES JF Science JO Science FD American Association for the Advancement of Science SP 628 OP 629 DO 10.1126/science.51.1330.628 VO 51 IS 1330 YR 1920 UL http://science.sciencemag.org/content/51/1330/628.abstract AB