- Romances, Spanish1
- Rome (Empire)1
- Sancho Garcés I, King of Navarre, -9251
- Sancho II, King of Castile and Leon, 1037 or 1038-10721
- Sarmiento, Pero. Sentencia-Estatuto1
- Satire1
- Satires1
- Science1
- Seals1
- Sententiarum libri IV (Peter Lombard, Bishop of Paris)1
- Sepúlveda, Juan Ginés de, 1490-15731
- Sermons1
- Sermons, Spanish1
- Service books (Music)--Catholic Church1
- Shipping1
- Shipwrecks1
- Sigismund II Augustus, King of Poland, 1520-15721
- Spain--Alcalá de Henares1
- Spain--Andalusia1
- Spain--Burgos1