RT Journal Article SR Electronic T1 Uranium-thorium-lead ages of the Highlandcroft Plutonic Suite, northern New England JF American Journal of Science JO Am J Sci FD American Journal of Science SP 489 OP 509 DO 10.2475/ajs.286.6.489 VO 286 IS 6 A1 John B. Lyons A1 John N. Aleinikoff A1 Robert E. Zartman YR 1986 UL http://www.ajsonline.org/content/286/6/489.abstract AB