2024-03-29T15:51:40Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:88809
2016-01-29T10:38:01Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary:EducationalMaterials:Astronomy KujawskoPomorskaDigitalLibrary