Tantalum-Niobium International Study Center - Brussels, Belgium

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

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

Test Your Knowledge of Niobium Mining - (Niocan Inc.) Includes facts about niobium mining in Canada

Niobium Chemistry - (WebElements.com) Chemical properties; description; isolation

Niobium - (Los Alamos National Laboratory's Chemistry Division) History; sources; properties; uses; isotopes

Niobium - (EnvironmentalChemistry.com) Atomic structure; chemical and physical properties; regulatory/health issues

Niobium Nuclides/Isotopes - (EnvironmentalChemistry.com)

The Element Niobium - (Jefferson Lab) History; uses; stable isotopes; oxidation states; electron shell configuration

Niobium - (Lenntech Water Treatment & Air Purification) Chemical properties; health effects; environmental effects

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