2024-03-28T14:01:31Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:88116
2016-01-29T10:37:00Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary:EducationalMaterials:Astronomy KujawskoPomorskaDigitalLibrary