https://vocabularyserver.com/tags/https://vocabularyserver.com/tags/xml.php?skosTema=1939Metric system https://vocabularyserver.com/tags/xml.php?skosTema=1939 Measurement RT https://vocabularyserver.com/tags/xml.php?skosTema=1939 Metrication UF https://vocabularyserver.com/tags/xml.php?skosTema=1939 Systems BT