RT Journal Article SR Electronic T1 Modes of occurrence of the diamond in Brazil JF American Journal of Science JO Am J Sci FD American Journal of Science SP 34 OP 42 DO 10.2475/ajs.s3-24.139.34 VO s3-24 IS 139 A1 Derby, Orville A. YR 1882 UL http://www.ajsonline.org/content/s3-24/139/34.abstract AB