Basic information, atomic structure, and table of isotopes.
Atomic structure, chemical and physical properties, and table of nuclides.
Basic physical and historical information.
Physical data, chemical properties, health and environmental effects.
Full text of the monograph by P. E. Figgins (Mound Laboratory, Miamisburg, Ohio).
Extensive information on history, occurrence, compounds, and properties.
Properties of the element, including its history, applications, and characteristics.
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