Britanica Nobel Prizes: Mendelevium: Overview and basic data.
ChemGlobe: Mendelevium: Electronic and thermal data along with an isotope table.
ChemicalElements.com: Mendelevium: Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Mendelevium: Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Mendelevium: Basic physical and historical information.
LANL: Mendelevium: History, isotopes, uses, and properties.
Lenntech: Mendelevium: Physical data and chemical properties.
Mendelevium: Data tables and historic information.
The Columbia Encyclopedia: Mendelevium: Brief overview for the general reader.
Visual Elements: Mendelevium: General and physical information, source, key isotopes.
WebElements: Mendelevium: Extensive information on history and properties.