Tantalum - Raw Materials and Processing - (Tantalum-Niobium International Study Center)

Tantalum-Niobium International Study Center - Brussels, Belgium

Tantalum Description and Isolation - (webelements.com)

Tantalum - (Los Alamos National Laboratory) History, sources, production, properties and uses

USGS Minerals Information - Niobium (Columbium) and Tantalum - (U.S. Geological Survey)

Tantalum - (Chemical & Engineering News) History, description, uses