Delpher is a freely accessible newspaper archive, developed and managed by the Koninklijke Bibliotheek (National Library of the Netherlands), filled with material from various Dutch libraries and institutes.
It contains newspapers, journals, digitized books and radio bulletins from the 17th to the 20th century. The content is constantly expanding.
In the Delpher guide (in Dutch), you learn more on how to find articles and which newspapers are available: https://libguides.ru.nl/kranten/delpher.
