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Title Matematika ako dobrodružstvo Author Šrobár Vratko Issue data Martin : Osveta , 1958. - 313 s. Copy count 1, currently available 1, Access to Shelves 1 Title Družice vo vesmíre Author Faukner R. Co-authors Šrobár Vratko Issue data Martin : Osveta , 1957. - 171 s. Copy count 1, currently available 1, Access to Shelves 1