Saltpeter —— The Mother of Gunpowder

----- 硝石：火药之母

ISBN: 9780199695751 出版年：2013 页码：250 Cressy, David Oxford University Press

The story of the science, the technology, the politics and the military applications of saltpeter - the vital but mysterious substance that governments from the Tudors to the Victorians regarded as an 'inestimable treasure'.