| 1251 | DUF1.1 | Dufraigne, Pierre | Adventus Augusti, adventus Christi | da |
| 1252 | DUH1.1.6 | Duhem, Pierre | Le systeme du monde, Tome VI | da |
| 1253 | DUH1.2 | Duhem, Pierre; Arrew, Roger (ed.) | Medieval Cosmology. Theories of infinity, place, time, void, and the plurality of worlds | da |
| 1254 | DUH1.3 | Duhem, Pierre | L' aube du savoir. Épitomé du système du monde (histoire des doctrines cosmologiques de Platon à Copernic) | da |
| 1255 | DUN1.1 | Dunne, Michael W.; Nolan, Simon, O. Carm. (eds) | Richard Fitzralph, His Life, Times and Thought | da |
| 1256 | DUN2.1 | Duncan, Dennis; Smyth, Adam (eds.) | Book parts | nu |
| 1257 | DUN3.1 | Dungalus Reclusus | Scrisoarea către Carol cel Mare despre dubla eclipsă de soare din anul 810 | da |
| 1258 | DYB1.1 | Dybel, Katarzyna | Entre la connaissance et l'amour. Le regard dans univers romanesque de Chretien de Troyes | da |
| 1259 | DYS1.1 | Dyson, Henry | Prolepsis and Ennoia in the early Stoa | da |
| 1260 | EatRoL3.2 | | Erudition and the Republic of Letters | da |
