It's Elemental: Germanium - Basic physical and historical information.
ChemicalElements.com: Germanium - Basic information, atomic structure, and isotopes.
USGS Minerals Information: Germanium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Germanium - Data tables and historic information.
EnvironmentalChemistry.com: Germanium - Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Germanium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Lenntech: Germanium - Physical data, chemical properties, health and environmental effects.
Discovery of Germanium - Article by Clemens Winkler.
Wikipedia: Germanium - Properties of the element, including its history, applications, and characteristics.
LANL: Germanium - History, sources, uses, and properties.
ChemGlobe: Germanium - Electronic, thermal, and steric data along with an isotope table.
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