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). EnvironmentalChemistry.com: Germanium - Atomic structure, chemical and physical properties, and table of nuclides. Lenntech: Germanium - Physical data, chemical properties, health and environmental effects. Wikipedia: Germanium - Properties of the element, including its history, applications, and characteristics. Radiochemistry of Germanium - Full text of the monograph by Jacob A. Marinsky (University of Buffalo, Dept. of Chemistry, Buffalo, New York).