RT Journal Article SR Electronic T1 On a group of dissimilar eruptive rocks in Campton, New Hampshire JF American Journal of Science JO Am J Sci FD American Journal of Science SP 147 OP 151 DO 10.2475/ajs.s3-17.98.147 VO s3-17 IS 98 A1 George Wesson Hawes YR 1879 UL http://www.ajsonline.org/content/s3-17/98/147.abstract AB