RT Journal Article SR Electronic T1 Cryptoexplosion structures; a discussion JF American Journal of Science JO Am J Sci FD American Journal of Science SP 650 OP 664 DO 10.2475/ajs.261.7.650 VO 261 IS 7 A1 Robert S. Dietz YR 1963 UL http://www.ajsonline.org/content/261/7/650.abstract AB In reply to objections raised against a meteorite impact origin for various cryptoexplosion structures, discusses some of the evidence which proves or strongly suggests that the structures are astroblemes.