Basic information and history.

Overview and basic data.

Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio). [PDF]

Basic physical and historical information.

Basic information, atomic structure, and isotopes.

Data tables and historic information.

General and physical information, source, and key isotopes.

Atomic structure, chemical and physical properties, and table of nuclides.

Extensive information on history, uses, occurrence, compounds, and properties.

Electronic, thermal, and steric data along with an isotope table.