RT Journal Article SR Electronic T1 Tertiary history of the Grand Canyon district JF American Journal of Science JO Am J Sci FD American Journal of Science SP 81 OP 89 DO 10.2475/ajs.s3-24.140.81 VO s3-24 IS 140 A1 Clarence E. Dutton YR 1882 UL http://www.ajsonline.org/content/s3-24/140/81.abstract AB