http://pxbzggit2rmlozurovt7s7brcuntf4bijigbeqgzajhmvylr3vpm5dad.onion/index71f3.html?product_cat=rocket-launcher
Partial copies of the original survived and Wujing Zongyao was republished in 1231 during the Southern Song Dynasty, including military developments since the original 1044 publication. The British scientist, sinologist, historian Joseph Needham asserts that the 1510 edition is the most reliable in its faithfulness to the original and 1231 versions, since it was printed from blocks that were re-carved directly from tracings of the edition made in 1231 AD.)...