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Diatom ecological response to deposition of the 833-850 CE White River Ash (east lobe) ashfall in a small subarctic Canadian
lake; Hutchinson, S J; Hamilton, P B; Patterson, R T; Galloway, J M; Nasser, N A; Spence, C; Falck, H. PeerJ 7, 6269, 2019 p.
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https://doi.org/10.7717/peerj.6269 
Open Access
(NRCan Cont.# 20180371)