| 1926 | KRI1.3 | Kristeller, Paul Oskar | Renaissance thought and its sources | nu |
| 1927 | KRU1.1 | Krüger, Max | Griechisches Ubungsbuch | da |
| 1928 | KRU2.1 | Kruger, Gerhart | Ragione e Passione, L'essenza del pensiero platonico | da |
| 1929 | KUH1.1 | Kühn, Wilfried | Quel savoir après le scepticisme? | da |
| 1930 | KÜN1.1 | Küng, Hans | Dans Christentum.Wesen und Geschichte | da |
| 1931 | KÜN1.2 | Küng, Hans | Erkämpfte Freiheit | da |
| 1932 | KÜN1.3 | Küng, Hans | Die Kirche | da |
| 1933 | KUN2.1 | Kunitzsch, Paul | The Arabs and the stars: texts and traditions on the fixed stars, and their influence in medieval Europe | da |
| 1934 | KUR1.1.1 | Kurfess, A. (ed.) | Appendix Sallustiana I | da |
| 1935 | KUR1.1.2 | Kurfess, A. (ed.) | Appendix Sallustiana II | da |
| 1936 | KUR2.1 | Kurdziałek, Marian | Prolegomena zu Davidis de Dinanto Quaternulorum fragmenta | da |
| 1937 | LAB1.1 | Labarbe, Jules | L`Homere de Platon | da |
| 1938 | LAC1.1 | Lacrosse, Joachim | La philosophie de Plotin. Intellect et discursivite | nu |
| 1939 | LAC2.1 | Lactantius | Von den Todesarten der Verfolger et al. | da |
| 1940 | LAF1.1 | Lafleur, Claude | Quatre introductions à la philosophie au XIIIe siècle | da |
| 1941 | LAG1.1.1 | Lagerlund, Henrik (ed.) | Encyclopedia of Medieval Philosophy. Philosophy Between 500 and 1500. Vol. 1 A-L | da |
| 1942 | LAG1.1.2 | Lagerlund, Henrik (ed.) | Encyclopedia of Medieval Philosophy. Philosophy Between 500 and 1500. Vol. 2 M-Z | da |
| 1943 | LAK1.1 | Laks, Andre | Diogene d'Apollonie | da |
| 1944 | LAN1.1 | Langermann, Y. Tzvi (ed.) | Avicenna and his legacy | da |
| 1945 | LAN2.1 | Landgraf, Artur Michael | Introduction a l'histoire de la littterature theologique de la scolastique naissante | da |
| 1946 | LAN3.1#1 | Lang, Helen S. | Aristotle's Physics and its medieval varieties | da |
| 1947 | LAN3.1#2 | Lang, Helen S. | Aristotle's Physics and its medieval varieties | da |
| 1948 | LAN4.1 | Landersdorfer, P. S. (tr.) | Ausgewälte Schriften der Syrischer Dichter | da |
| 1949 | LAN5.1 | Lancel, Serge | Saint Augustin | da |
| 1950 | LAS1.1 | Lassere, F. | Etude sur les extraits medievaux de Strabon suivie d'un traite inedit de Michel Psellus | da |
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