Californium

ChemGlobe: Californium
Electronic and thermal data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/98.html

ChemicalElements.com: Californium
Basic information, atomic structure, and isotopes table.
http://www.chemicalelements.com/elements/cf.html

EnvironmentalChemistry.com: Californium
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Cf.html

It's Elemental: Californium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele098.html

LANL: Californium
Basic information and history.
http://periodic.lanl.gov/elements/98.html

Lenntech: Californium
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Cf-en.htm

Visual Elements: Californium
General and physical information, uses, and key isotopes.
http://www.chemsoc.org/viselements/pages/californium.html

WebElements: Californium
Extensive information on history, uses, compounds, and properties.
http://www.webelements.com/webelements/elements/text/Cf/key.html