RT Journal Article SR Electronic T1 On Dr. Peale's Notes on the age of the Rocky Mountains in Colorado JF American Journal of Science JO Am J Sci FD American Journal of Science SP 297 OP 299 DO 10.2475/ajs.s3-13.76.297 VO s3-13 IS 76 A1 Stevenson, John James YR 1877 UL http://www.ajsonline.org/content/s3-13/76/297.abstract AB