RT Journal Article SR Electronic T1 The secular variation of latitudes JF American Journal of Science JO Am J Sci FD American Journal of Science SP 470 OP 482 DO 10.2475/ajs.s3-42.252.470 VO s3-42 IS 252 A1 G. C. Comstock YR 1891 UL http://www.ajsonline.org/content/s3-42/252/470.abstract AB