WebElements: Potassium - Extensive information on history, uses, occurrence, compounds, and properties of the element..
Wikipedia: Potassium - Properties of the element, including its history, applications, and characteristics..
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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