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XXX. On the new metals, lanthanium and didymium, which are associated with cerium; and on erbium and terbium, new metals associated with yttria

According to PR-model, XXX. On the new metals, lanthanium and didymium, which are associated with cerium; and on erbium and terbium, new metals associated with yttria is ranked 417,185th in multilingual Wikipedia, in particular this website is ranked 517,538th in English Wikipedia.

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