In this post I illustrate an approach to detect Wikipedia articles whose contents are fully or largely based on content from a single online source, such as a full-text digitized newspaper archive or a digital text library. Using Dutch Wikipedia I track down 247 articles that owe their existence to Delpher and DBNL, two full-text collections operated by the KB, the national library of the Netherlands. This approach might be relevant for GLAMs that have digital text collections used by the Wikipedia community for writing articles. ... : This article is also available at * Github : https://github.com/KBNLwikimedia/KB-Wiki-Stats-Graphs/blob/master/stories/Detecting%20Wikipedia%20articles%20strongly%20based%20on%20single%20library%20collections.md * Wikimedia Commons : https://commons.wikimedia.org/wiki/File:Detecting_Wikipedia_articles_strongly_based_on_single_library_collections_-_Olaf_Janssen,_KB,_21_May_2020.pdf ...