For much more precise, relevant results, try the following instead of SuperSearch:
Internet Medieval Sourcebook - Full-text sources on all regions and subjects, translated, from Fordham University
Medieval Texts in Translation - From the University of Leeds.
Epistolae: Medieval Women's Letters - Letters to and from women, 4th-13th centuries AD, in translation, by Dr. Joan Ferrante.
EuroDocs - Search by country, then scroll through the chronologically arranged primary sources. Not everything is translated.
Crusade Texts in Translation - European and Muslim perspectives in many separate ebook volumes.
Labyrinth: Resources for Medieval Studies - A collection of primary sources in translation from Georgetown University.
ArtStor - Digitized images of art, architecture and artifacts from many periods and places in the world.