The NCC contains bibliographic data and locations of more than 14 million books and 500,000 magazines operating in more than 400 Netherlands libraries are found.

The database is updated by the libraries that participate in the Gemeenschappelijk Geautomatiseerd Catalogussysteem (GGC; Shared Automated Cataloguing System).

The catalog data has been digitized and is openly accessible online, in multiple languages, via the Dutch website, PiCarta [nl].

[2] The initial effort culminated in massive collection catalog cards stored at the National Library of the Netherlands in The Hague.

As a precursor for the launch, Molhuysen and Elsa Rachel Oppenheim (1885–1941) — his second of three wives — together, completed in 1916 the Catalogue de la Bibliothèque du Palais de la Paix, for the Peace Palace law library in The Hague.