Libraries that hold Tolkien collections
The homepage of the venerable Bodleian Library in Oxford (UK), one of the finest and oldest libraries in the world, which holds a majority of J.R.R Tolkien's manuscripts and documents.
Their online store contains some licensed reproductions of Tolkien's art.
Marquette University, in Milwaukee (US), also hold a "J.R.R. Tolkien Collection", containing the manuscripts of The Lord of the Rings, and some others (including Mr Bliss).