Unlike in the US, most genealogical records and collections in the Netherlands can be found in archives, not libraries or courthouses. Most libraries do not have a genealogical collection, just some published books about genealogy. Courthouses, municipalities and other governmental agencies are required by law to transfer their permanent records to an archive, usually after 20 years.
If you want to consult original records, genealogical publications or newspapers, archives are your best bet. You can find their websites on Archiefnet (Archivenet).