ChemGlobe: Magnesium
- Electronic, thermal, and steric data along with basic information.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/12.html

LANL: Magnesium
- History, properties, uses, compounds, and handling.
- http://periodic.lanl.gov/elements/12.html

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

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

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

Visual Elements: Magnesium
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/magnesium.html

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

It's Elemental: Magnesium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele012.html

ChemicalElements.com: Magnesium
- Basic information, atomic structure, and table of isotopes.
- http://www.chemicalelements.com/elements/mg.html

Radiochemistry of Magnesium
- Full text of the monograph by A. W. Fairhall (Dept. of Chemistry, University of Washington, Seattle, Washington). [PDF]
- http://lib-www.lanl.gov/cgi-bin/getfile?rc000047.pdf