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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Trends

Notes

History