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Britannica Nobel Prize: Americium - Overview and basic data.
ChemGlobe: Americium - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Americium - Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Americium - Atomic structure, properties, and table of nuclides.
It's Elemental: Americium - Basic physical and historical information.
LANL: Americium - Basic information and history.
Lenntech: Americium - Physical data, chemical properties, health and environmental effects.
Visual Elements: Americium - Image, general and physical information, and key isotopes.