Presentation about using Linked Open Data to crowdsource Dutch WW2 underground newspapers on Wikipedia, SWIB 2016, 29-11-2016 in Bonn. The presentation describes a project to systematically describe and interlink 1,300 Dutch underground newspapers from World War 2 on Wikipedia using linked open data. The project extracts contextual information about the newspapers from a book, converts it to structured data, and generates Wikipedia stubs linked to metadata, full texts, and each other. Volunteers are expanding the stubs into full articles, improving access to information about this historical period. Abstract During the second World War some 1.300 illegal newspapers were issued by the Dutch resistance. Right after the war as many of these newspapers as possible were physically preserved by Dutch memory institutions. They were described in formal library catalogues that were digitized and brought online in the 1990s. In 2010 the national collection of underground newspapers - some 200.000 pages - was full-text ...