Handbook on the Physics and Chemistry of Rare Earths: Vol 2 to Vol 4

ALSO FROM AN EARLIER POSTING OF MINE (For the benefit of those that don't yet have it) :

Highly experienced authors have written each review usually at a level suitable for advanced postgraduate students and research workers from a variety of fields. With the great richness of information involving references to other review articles written from different points of view, the books are an important reference source and should be on the shelves of most libraries. (Journal of Applied Crystallography)
Thanks to the original uploader!