ChemGlobe: Cadmium
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/48.html

LANL: Cadmium
- Basic information, history, uses, and cost.
- http://periodic.lanl.gov/elements/48.html

Wikipedia: Cadmium
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Cadmium

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

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

USGS Minerals Information: Cadmium
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- http://minerals.usgs.gov/minerals/pubs/commodity/cadmium/

ChemicalElements.com: Cadmium
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/cd.html

It's Elemental: Cadmium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele048.html

Visual Elements: Cadmium
- Image, uses, physical information, key isotopes, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/cadmium.html