ChemGlobe: Dubnium
   Electronic data along with an isotope table and basic facts.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/105.html

ChemicalElements.com: Dubnium
   Diagram of its atomic structure, and basic information.
   http://www.chemicalelements.com/elements/db.html

EnvironmentalChemistry.com: Dubnium
   Atomic structure, physical properties, and table of nuclides.
   http://environmentalchemistry.com/yogi/periodic/Db.html

It's Elemental: Dubnium
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele105.html

LANL: Dubnium
   Basic information, history, and isotopes.
   http://periodic.lanl.gov/elements/105.html

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

Visual Elements: Dubnium
   Image, general and physical information, and key isotopes.
   http://www.chemsoc.org/viselements/pages/dubnium.html