Housed in the Hôtel de Breteuil, the Bibliothèque des Archives nationales holds a rich collection of approximately 150,000 volumes and several hundred periodical titles related to archival holdings and the work of archivists. If his works are indicated in the catalog of the "Sudoc" and accessible to all in the reading room of the Caran, its oldest premises are only occasionally open to the visit, which will also be the opportunity to discover, in the Hotel d'Assy, a very beautiful 18th century lounge, work of Gilles Marie Oppenord.