RT Journal Article SR Electronic T1 Longitude determination across the continent JF American Journal of Science JO Am J Sci FD American Journal of Science SP 441 OP 448 DO 10.2475/ajs.s3-2.12.441 VO s3-2 IS 12 A1 Dean, George W. YR 1871 UL http://www.ajsonline.org/content/s3-2/12/441.abstract AB