2024-03-29T13:45:33Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:44477
2022-09-08T18:49:58Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials:Mathematics KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary:EducationalMaterials:Science KujawskoPomorskaDigitalLibrary:EducationalMaterials:Astronomy KujawskoPomorskaDigitalLibrary