PPM Pure Metals GmbH
Producer of high purity metals and chemicals used in electronics, fiber optics, and semiconductors. Products include germanium, germanium tetrachloride, germanium oxide, arsenic, antimony, copper, cadmium and tellurium.
http://www.ppmpuremetals.de/

Chemical and Technical Developments Ltd
Chemical and Technical Developments Ltd is based in the Porton Down Science Park, located near Salisbury in Wiltshire UK. We supply chemicals and provide engineering services - CAESIUM CARBONATE, CAESIUM NITRATE, DYSPROSIUM CHLORIDE, EUROPIUM BROMIDE, EUROPIUM CHLORIDE, GADOLINIUM CHLORIDE, GERMANIUM DIOXIDE, GERMANIUM TETRACHLORIDE, LANTHANUM CHLORIDE, NEODYMIUM CHLORIDE, NIOBIUM PENTOXIDE, POTASSIUM TELLURITE HYDRATE, PRASEODYMIUM CHLORIDE, SAMARIUM CHLORIDE, SCANDIUM CHLORIDE, TUNGSTEN OXYCHLORIDE, YTTRIUM CHLORIDE - as well as providing a range of engineering service
http://www.chemicalandtechnical.com

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

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

It's Elemental: Germanium
The Element Germanium - Basic Physical and Historical Information
http://education.jlab.org/itselemental/ele032.html

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

Cominco Ltd.
Teck is a mining company, headquartered in Vancouver, Canada. Shares are listed on the TSE under the symbols TCK.A and TCK.B and on the NYSE under the symbol TCK. This mining company is a world leader in the production of zinc and metallurgical coal and also produces copper, gold, indium, germanium and other metals.
http://www.teckcominco.com/

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

ChemGlobe: Germanium
The chemical element [Ge] - Germanium - Datasheet
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/32.html

EnvironmentalChemistry.com: Germanium
Comprehensive information for the element Germanium – Ge is provided by this page including scores of properties, element names in many languages, most known nuclides and technical terms are linked to their definitions.
http://environmentalchemistry.com/yogi/periodic/Ge.html