Thank you Joe. I went to that place, to find that the Spanish version is missing too. They are Germans, and for now, they only have a German version. (Ask me to sing Brahms and Wagner and I´ll do it, but don´t ask me to translate German ) :)
However This site offers a good biography of Violeta, in English.
Un abrazo - Andrés
(By the way, Joe, that CD of Paul Robeson is totally out of stock. I´ll shamelessly make a copy and send the original to you)