ChemGlobe: Rutherfordium
   Electronic and thermal data along with an isotope table.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/104.html

ChemicalElements.com: Rutherfordium
   Basic information, atomic structure, and isotopes.
   http://www.chemicalelements.com/elements/rf.html

EnvironmentalChemistry.com: Rutherfordium
   Atomic structure and table of nuclides.
   http://environmentalchemistry.com/yogi/periodic/Rf.html

It's Elemental: Rutherfordium
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele104.html

LANL: Rutherfordium
   Basic information, history, and isotopes.
   http://periodic.lanl.gov/elements/104.html

Lenntech: Rutherfordium
   Physical data and chemical properties.
   http://www.lenntech.com/Periodic-chart-elements/Rf-en.htm

Visual Elements: Rutherfordium
   Physical information, key isotopes, and ionisation energies.
   http://www.chemsoc.org/viselements/pages/rutherfordium.html