2026-04-03T12:21:44Z https://obc.opole.pl/oai-pmh-repository.xml

oai:obc.opole.pl:23279 2025-06-18T12:46:34Z dLibraDigitalLibrary dLibraDigitalLibrary:Opole dLibraDigitalLibrary:regional_collection dLibraDigitalLibrary:regional_collection:periodical