ChemGlobe: Germanium
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/32.html

LANL: Germanium
- History, sources, uses, and properties.
- http://periodic.lanl.gov/elements/32.html

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

Discovery of Germanium
- Article by Clemens Winkler.
- http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Disc-of-Germanium.html

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

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

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

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

It's Elemental: Germanium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele032.html

Radiochemistry of Germanium
- Full text of the monograph by Jacob A. Marinsky (University of Buffalo, Dept. of Chemistry, Buffalo, New York). [PDF]
- http://lib-www.lanl.gov/cgi-bin/getfile?rc000036.pdf