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Promethium
http://en.wikipedia.org/wiki/Promethium
Field Hierarchy
Parent
Europium
20.3k
papers
Erbium
17.5k
papers
Neodymium
14.6k
papers
Ytterbium
14.4k
papers
Terbium
8,908
papers
Holmium
5,389
papers
Thulium
5,355
papers
Current
Promethium
papers
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History
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