books.google.cat - Gunpowder studies are still in their infancy despite the long-standing civil and military importance of this explosive since its discovery in China in the mid-ninth century AD. In this second volume by contributors who meet regularly at symposia of the International Committee for the History of Technology...https://books.google.cat/books/about/Gunpowder_Explosives_and_the_State.html?hl=ca&id=7n6Cg9znFrUC&utm_source=gb-gplus-shareGunpowder, Explosives and the State
