Hi! The map is based on a sketch of a scholarly article. I edited and enhanced it in Photoshop in order to make it presentable and, crucially, to avoid copyright issues. At the moment i don't know, which paper it was. I'll check it out and get back to you soon. All the best Wikirictor 01:54, 13 December 2020 (UTC)[reply]
- This is the source text, that includes the sketch: [1]. It is titled: Political Regionalization of East Prussia, an excerpt of the book: Multicultural Regions and Cities, published by the University of Łódź, Author: Jan A. Wendt.
- BTW The platform is Researchgate. You might have to become a user in order to access publications. All the best Wikirictor 02:12, 13 December 2020 (UTC)[reply]