RT Journal Article SR Electronic T1 Coggia's Comet, its physical condition and structure; physical theory of comets JF American Journal of Science JO Am J Sci FD American Journal of Science SP 161 OP 177 DO 10.2475/ajs.s3-15.87.161 VO s3-15 IS 87 A1 Norton, W. A. YR 1878 UL http://www.ajsonline.org/content/s3-15/87/161.abstract AB