Meyers Orts- und Verkehrs-Lexikon des Deutschen Reichs (Meyers Gazetteer), online edition, with GOV (genealogy.net) for post-1945 Polish equivalents · meyersgaz.org / gov.genealogy.net
Marienwerder, Poland (Nominatim pin 53.7336,18.9319 = Kwidzyn, Q326582)
The only Marienwerder now in Poland is West Prussian Marienwerder (other Meyers Marienwerders: Potsdam, near Hannover, Kr. Pyritz). Merge into 547 deferred.