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
Schloin 2), Grünberg, Liegnitz, Schlesien, Preussen | 51.92796392,15.39624967
Meyers page re-fetched this session; Wikidata Q7667350 confirms P31=village of Poland, P17=Poland; Nominatim reverse-geocode lands in the village of Słone.