https://vocabularyserver.com/udc/en/ Universal Decimal Classification UDC Consortium UDC Consortium 2019-03-06 en 2019-03-06 15:43:53 Watercraft engineering. Marine engineering. Boats. Ships. Boatbuilding and shipbuilding 2019-03-06 15:43:53https://vocabularyserver.com/udc/en/xml.php?skosTema=1731