» 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).    http://library.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