Niobium

TANTALUM-NIOBIUM INTERNATIONAL STUDY CENTER
An international, non-profit association founded in 1974, involved with all aspects of the tantalum and niobium industry.
United States Geological Survey
Basic Information on niobium.
Wikipedia
Open source encyclopedia article on niobium.
Rembar
Specialists in refractory metals and their precision fabrication. Lots of information and history of niobium.
Elementymology & Elements Multidict - Niobium
Information on the history and origin of element names and their translations into many different languages.