2024-03-28T11:49:54Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:88473
2016-01-29T10:39:00Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary:EducationalMaterials:Astronomy KujawskoPomorskaDigitalLibrary