タンコ鉱山
Garrett, Donald E. (2004). Handbook of lithium and natural calcium chloride: their deposits, processing, uses and properties. Academic Press. pp. 150–157. ISBN 978-0-12-276152-2. https://books.google.com/books?id=Ua2SVcUBHZgC&pg=PA150
National Materials Advisory Board (U.S.). Committee on the Technical Aspects of Critical and Strategic Materials (1983). Tantalum and columbium supply and demand outlook. National Academies. pp. 23. https://books.google.com/books?id=KiQrAAAAYAAJ&pg=PA23