However, geographic documents are very heterogeneous with reference to their formal appearance. Currently, we have 334 general, national, and regional atlases in 476 volumes, some of them are presented on CD-Rom support. The atlases represent closed map collections that offer structured interpretations of the territory. Texts, graphs and tables often add complementary information to the maps.
Atlases are the highest charged with information geographic documents.
We must take into consideration that atlases are indispensable for obtaining thematic maps both on human geography maps and physical geography maps. Due to this reason, as started some years ago, the Map Library will continue acquiring as many and varied of these documents as possible. Regarding maps , we also classify plans, navigation charts that are presented in single sheets. The map collection comprises 26,322 sheets grouped into 2,874 cartographic documents. You must realise that a map may be presented in just one or more sheets.