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

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

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

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

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

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

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

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

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/

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