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See also:
- ChemGlobe: Protactinium - Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Protactinium - Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Protactinium - Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Protactinium - Basic physical and historical information.
- LANL: Protactinium - Basic information and history.
- Visual Elements: Protactinium - General and physical information, source, and key isotopes.
- WebElements: Protactinium - Extensive information on history, uses, occurrence, compounds, and properties.
- Radiochemistry of Protactinium - Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio). [PDF] (December, 1959)
