- Laminación
- Latindex
- Layar
- LIBER : Ligue des Bibliothèques Européennes de Recherche – Association of European Research Libraries
- LibQUAL+
- LibraryH3lp
- LibraryThing
- LILACS
- LISA : Library and Information Science Abstracts
- Literatura gris
- LOCKSS : Lots Of Copies Keep Stuff Safe
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