Didymium
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- Separation of Didymium from Lanthanum by Liquid-Liquid Extraction Using Organophosphorus Acids and Acetic Acid
- The History and Future of Rare Earth Elements
- Textbooks: Other References
- Inemi White Paper: Rare Earth Metals Current Status & Future Outlook
- Two Hundred Years Selenium Fathi Habashi
- Dominating the World China and the Rare Earth Industry
- Observations on the Rare Earths: a Study of Some Methods for the Separation of Gadolinium
- “Ytterbite”, Ytterby, Sweden (Carl Axel Arrhenius, 1757-1824) Late 1780S
- Nov. 17, 1959 C
- PRASEODYMIUM Element Symbol: Pr Atomic Number: 59