RT Journal Article SR Electronic T1 Gravels of southern Delaware JF American Journal of Science JO Am J Sci FD American Journal of Science SP 36 OP 43 DO 10.2475/ajs.s3-29.169.36 VO s3-29 IS 169 A1 F. D. Chester YR 1885 UL http://www.ajsonline.org/content/s3-29/169/36.abstract AB