Waters, Michael R.; Stafford, Thomas W.; McDonald, H. Gregory; Gustafson, Carl; Rasmussen, Morten; Cappellini, Enrico; Olsen, Jesper V.; Szklarczyk, Damian; Jensen, Lars Juhl (October 21, 2011). "Pre-Clovis Mastodon Hunting 13,800 Years Ago at the Manis Site, Washington". Science. 334 (6054): 351–353. Bibcode:2011Sci...334..351W. doi:10.1126/science.1207663. ISSN0036-8075. PMID22021854. S2CID26346378.
Kenneth L. Petersen; Peter J. Mehringer Jr; Carl E. Gustafson (September 1983). "Late-glacial vegetation and climate at the Manis Mastodon site, Olympic Peninsula, Washington". Quaternary Research. 20 (2): 215–231. Bibcode:1983QuRes..20..215P. doi:10.1016/0033-5894(83)90078-9.
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Waters, Michael R.; Stafford, Thomas W.; McDonald, H. Gregory; Gustafson, Carl; Rasmussen, Morten; Cappellini, Enrico; Olsen, Jesper V.; Szklarczyk, Damian; Jensen, Lars Juhl (October 21, 2011). "Pre-Clovis Mastodon Hunting 13,800 Years Ago at the Manis Site, Washington". Science. 334 (6054): 351–353. Bibcode:2011Sci...334..351W. doi:10.1126/science.1207663. ISSN0036-8075. PMID22021854. S2CID26346378.
Kenneth L. Petersen; Peter J. Mehringer Jr; Carl E. Gustafson (September 1983). "Late-glacial vegetation and climate at the Manis Mastodon site, Olympic Peninsula, Washington". Quaternary Research. 20 (2): 215–231. Bibcode:1983QuRes..20..215P. doi:10.1016/0033-5894(83)90078-9.