Documentation
- thematic library keeping numerous valuable old prints
- central catalogue of medieval charters, compiled by professor Božo Otorepec
- legacy of professors Franc and Milko Kos; correspondence, manuscripts, materials for topography of Primorska [Littoral]
- legacy of professor Pavle Blaznik; manuscripts, materials for topographies of Slovenian Štajerska province [Styria] and Slovenian part of Koroška province [Carinthia].
- legacy of professor Henrik Tuma