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
Meyers Gazetteer 1912 (meyersgaz.org all.json, id 20029030): 'Lauenburg 1) Pomm. | , Köslin, Preussen | KrSt. (County Seat)'; Wikidata Q497148 Lębork, aliases 'Lauenburg in Pommern', 'Lauenburg i. Pom.'
Of seven Lauenburg entries only 1) Pomm. sits under Köslin, matching 'Ceslice' ≈ Cöslin; identification probable.