Towards a theory for U.D.C / essays aimed at structural understanding and operational improvement 2026-02-15T10:42:15+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Perreault, Jean M., 1931 (Clive Bingley, 1969)