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The Anthropocene: a comparison with the Ordovician–Silurian boundary
RENDICONTI LINCEI, 2014J. Zalasiewicz, M. Williams
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A Critical Revision of the Rugose Corals described by W. Lonsdale in Murchison's ‘Silurian System’
Quarterly Journal of the Geological Society of London, 1927W. D. Lang, Stanley Smith
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