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
Guhren 1), Züllichau-Schwiebus, Frankfurt, Brandenburg, Preussen
Quoted from modern place #22486's own stored note (fetched this session via get_place): Meyers 1912 exact match, only Brandenburg/Züllichau-Schwiebus hit among 4 exact 'Guhren' entries.