For more than 80 years the Meertens Institute acquires and creates (by its researchers) archives and collections. This unique material about Dutch Ethnology and Language Variation is part of the national heritage of the Netherlands.
Currently the institute has more than 700 collections consisting of (digital) research data, digitized material, archival collections, printed material, handwritten questionnaires, maps and pictures. Click here for an overview.
Additionally, the Meertens Institute has thousands of hours of audio material. The Dutch Dialect Database (more than 1000 hours of dialect recordings) is available online. The other audio collections (over 5000 hours) are digitized and will partly become available online in the future. The overview of these collections can be found here. Further information on audio digitization can be read here.