ChemGlobe: Fermium: Electronic and thermal data along with an isotope table.
ChemicalElements.com: Fermium: Basic information, diagram of atomic structure, and facts.
EnvironmentalChemistry.com: Fermium: Atomic structure, chemical and physical properties, and table of nuclides.
Fermium: Data tables and historic information.
It's Elemental: Fermium: Basic physical and historical information.
LANL: Fermium: History, properties, and isotopes.
Lenntech: Fermium: Physical data and chemical properties.
Visual Elements: Fermium: Image, discovery, physical information, and ionisation energies.
WebElements: Fermium: Extensive information on history, compounds, and properties.