RT Journal Article SR Electronic T1 Geological observations on Isla de la Plata, Ecuador JF American Journal of Science JO Am J Sci FD American Journal of Science SP 480 OP 486 DO 10.2475/ajs.s5-13.78.480 VO s5-13 IS 78 A1 Sheppard, G. YR 1927 UL http://www.ajsonline.org/content/s5-13/78/480.abstract AB