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Books about Berswordt:
"Der Meister des Berswordt-Altares" (Goppinger akademische Beitrage) (German Edition) by Friedrich Jacobs (1983)
Wiki information Berswordt:
The Master of the Berswordt Altar was a German painter, active in the area around Dortmund during the 14th and 15th centuries. A number of works around Westphalia, including one in Bielefeld, are attributed to him.