| 1926 | LIC1.1 | Granius Licinianus | Relivae | da |
| 1927 | LIC2.1 | Lickteig, Franz-Bernard | The german Carmelites at the Medieval universities | da |
| 1928 | LID1.1 | H. G. Lidell and R. Scott | Greek-English Lexicon, with a Revised Supplement | da |
| 1929 | LIE1.1 | Beatus Liebanensis | Obras completas y complementarias I (Comentario al Apocalipsis, Himno "O Dei Verbum", Apologético ) | da |
| 1930 | LIL1.1 | Lille, Alain de | Anticlaudianus | da |
| 1931 | LIL1.2 | Lille, Alain de | Viaggio della saggezza | da |
| 1932 | LIL1.3 | Lille, Alain de | Regeln der Theologie | da |
| 1933 | LIL1.4 | Lille, Alain de; Alverny, Marie-Thérèse d' | Textes inedits | da |
| 1934 | LIN1.1 | Lindberg, David C. | Beginnings of Western Science: The European Scientific Tradition in Philosophical, Religious, and Institutional Context, 600 B.C. to A.D. 1450 | nu |
| 1935 | LIT1.1 | Little, A. G. (ed.) | Initia Operum Latinorum quae saeculis XIII, XIV, XV attribuuntur | da |
| 1936 | LIV1.1 | | Le Livre des XXIV Philosophes | da |
| 1937 | LIV2.1.1 | Livius, Titus | Ab Urbe condita ( XXI, XXII) | da |
| 1938 | LIV2.1.2 | Livius, Titus | Ab Urbe condita (XXIII - XXV) | da |
| 1939 | LIV2.1.3 | Livius, Titus | Ab Urbe condita ( XXVI - XXX) | da |
| 1940 | LIV2.2.1.2 | Livius, Titus | Ab urbe condita ( IV-VI) | da |
| 1941 | LIV2.3.1 | Livivs, Titus | Ab vrbe condita ( XXI-XXII) | da |
| 1942 | LIV2.3.2 | Livius, Titus | Ab urbe condita (XXVI-XXVII) | da |
| 1943 | LIV2.3.3 | Livius, Titus | Ab vrbe condita ( XXVIII-XXX) | da |
| 1944 | LIV3.1 | Livadiotti, Umberto | Anonimo del IV seccolo. Descrizione del mondo e delle sue genti | da |
| 1945 | LLO1.1 | Llorente Megias, Paloma; Otero Vidal, Merce | Liber de causis. Indice y Concordancia | da |
| 1946 | LLO2.1 | Lloyd, Geoffrey Ernest Richard | The ambivalences of rationality : ancient and modern cross-cultural explorations | da |
| 1947 | LOC1.1 | Locke, John | John Locke: literary and historical writings | nu |
| 1948 | LOH1.1.1.1 | Lohr, Charles H. | Latin Aristotle Commentaries. I.1 Medieval Authors A-L | da |
| 1949 | LOH1.1.1.2 | Lohr, Charles H. | Latin Aristotle Commentaries. I.2 Medieval Authors M-Z | da |
| 1950 | LOH1.1.2 | Lohr, Charles H. | Latin Aristotle Commentaries. II. Renaissance Authors | da |
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