RT Journal Article SR Electronic T1 Rigidity not to be relied upon in estimating the Earth's age JF American Journal of Science JO Am J Sci FD American Journal of Science SP 464 OP 468 DO 10.2475/ajs.s3-45.270.464 VO s3-45 IS 270 A1 Fisher, O. YR 1893 UL http://www.ajsonline.org/content/s3-45/270/464.abstract AB