RT Journal Article SR Electronic T1 Crystallographic notes JF American Journal of Science JO Am J Sci FD American Journal of Science SP 377 OP 380 DO 10.2475/ajs.s3-32.191.377 VO s3-32 IS 191 A1 W. G. Brown YR 1886 UL http://www.ajsonline.org/content/s3-32/191/377.abstract AB