2024-03-29T13:00:56Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:76807
2016-01-29T10:35:31Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary:EducationalMaterials:Astronomy KujawskoPomorskaDigitalLibrary