2024-03-29T03:17:53Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:196352
2018-04-18T12:42:34Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary:EducationalMaterials:Science KujawskoPomorskaDigitalLibrary