"and floated out into the studious silence of the library of Saint Genevieve where he had read," (U2.68)
The library of Sainte-Geneviève is located near the Pantheon on the Mont Sainte-Geneviève in Paris (5e). It is one of the oldest libraries in the world, founded in the 5c. The current building was erected 1844-1851. Geneviève is one of the patron saints of Paris.