RT Journal Article SR Electronic T1 THE CANNONBALL LANCE FORMATION JF Science JO Science FD American Association for the Advancement of Science SP 27 OP 29 DO 10.1126/science.54.1384.27-a VO 54 IS 1384 A1 Matthew, W. D. YR 1921 UL http://science.sciencemag.org/content/54/1384/27.2.abstract AB