Library of Congress classification schedules: a cumulation of additions and changes through 1978 : Class Z, Bibliography and library science 2026-02-15T16:01:22+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... (Gale Research Co., 1980)