However , the catalogs of some national libraries effectively serve as national bibliographies ( de ) , as the national libraries own almost all their countries ' publications .
Bibliographies differ from library catalogs by including only relevant items rather than all items present in a particular library .
The catalogs of some national libraries effectively serve as national bibliographies ( de ) , as the national libraries own almost all their countries ' publications .
Bibliographies differ from library catalogs by including only relevant items rather than all items present in a particular library .