Secretum secretorum, etc.,
Selected prayers,
Selected prayers,
Sermon notes,
Sermon notes,
Sermons of Lewis Price,
Sermons,
Sermons,
Sermons,
Sheriffs of North Wales,
Sheriffs of North Wales,
Sir Kenelm Digby,
Siryddion ac is-siryddion Trefaldwyn,
Siryddion ac is-siryddion Trefaldwyn,
South-west Wales pedigrees,
South-west Wales pedigrees,
Speculum mathematicum,
Speculum mathematicum,
Spiritual rules,
Spiritual rules,
Statements and musings of John Jones,
Statements and musings of John Jones,
Statud Rhuddlan,
Steganographiae,
Swyn-gyfareddion,
Synopsis Methodica Stirpium Britannicarum,
Synopsis Methodica Stirpium Britannicarum,
Tadogolion Eiriau dau Sillafog,
Tair geirfa,
Tair geirfa,
Testunau gramadegol,