RT Journal Article SR Electronic T1 Note on the decay of rocks in Brazil JF American Journal of Science JO Am J Sci FD American Journal of Science SP 138 OP 139 DO 10.2475/ajs.s3-27.158.138 VO s3-27 IS 158 A1 O. A. Derby YR 1884 UL http://www.ajsonline.org/content/s3-27/158/138.abstract AB