https://vocabularyserver.com/dtic/https://vocabularyserver.com/dtic/xml.php?skosTema=3146COMPOSITE PROPELLANTS https://vocabularyserver.com/dtic/xml.php?skosTema=3146 DOUBLE BASE PROPELLANTS RT https://vocabularyserver.com/dtic/xml.php?skosTema=3146 SOLID PROPELLANTS BT