This is the basic reference library of all Wagner's works translated into English (mostly the hardgoing Ashton-Ellis, but better than nothing):
http://users.belgacom.net/wagnerlibrary/
The following books on Richard Wagner are out of copyright and are available online.
Chamberlain, Houston Stewart, Richard Wagner, |
Chamberlain, Houston Stewart, Richard Wagner, |
Adolphe Jullien; Florence Percival Hall, Richard Wagner, his life and works Boston, J.B. Millet Co., 1892. |
Franz Muncker; D Landman, Richard Wagner; a sketch of his life and works Bamberg, Buchner, 1891. |