ChemGlobe: Seaborgium
   Electronic data and isotope table.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/106.html

ChemicalElements: Seaborgium
   Basic information.
   http://www.chemicalelements.com/elements/sg.html

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

It's Elemental: Seaborgium
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele106.html

LANL: Seaborgium
   Basic information and history.
   http://periodic.lanl.gov/elements/106.html

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

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

Wikipedia: Seaborgium
   History and basic information on the element.
   http://en.wikipedia.org/wiki/Seaborgium