See also:
 | - WebElements: Potassium - - Extensive information on history, uses, occurrence, compounds, and properties of the element.
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 | - Wikipedia: Potassium - - Properties of the element, including its history, applications, and characteristics.
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 | - Radiochemistry of Potassium - - Full text of the monograph by William T. Mullins and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (November, 1961)
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