RT Journal Article SR Electronic T1 Epic pre-Columbian voyage suggested by genes JF Science JO Science FD American Association for the Advancement of Science SP 406 OP 406 DO 10.1126/science.346.6208.406 VO 346 IS 6208 A1 Lawler, Andrew YR 2014 UL http://science.sciencemag.org/content/346/6208/406.abstract AB