https://vocabularyserver.com/udc/en/ Universal Decimal Classification UDC Consortium UDC Consortium 2019-03-06 en 2019-03-06 15:43:39 Special auxiliary subdivision for physical chemistry 2019-03-06 15:43:39https://vocabularyserver.com/udc/en/xml.php?skosTema=1326https://vocabularyserver.com/udc/en/xml.php?skosTema=1335https://vocabularyserver.com/udc/en/xml.php?skosTema=1336https://vocabularyserver.com/udc/en/xml.php?skosTema=1337https://vocabularyserver.com/udc/en/xml.php?skosTema=1338