RT Journal Article SR Electronic T1 AERIAL OBSERVATION OF EARTHQUAKE RIFTS JF Science JO Science FD American Association for the Advancement of Science SP 266 OP 268 DO 10.1126/science.54.1395.266 VO 54 IS 1395 A1 Willis, Bailey YR 1921 UL http://science.sciencemag.org/content/54/1395/266.abstract AB