When was Sun Bin's Art of War unearthed from the Han Tomb in Yinque Mountain, Linyi, Shandong Province?

1 In April, 1972, two tombs of the early Western Han Dynasty were excavated on Yinshan Mountain in Linyi, Shandong Province, which were designated as1tomb and Yinshan Mountain No.2 tomb respectively. There are 4,942 bamboo slips unearthed in tomb 1, most of which are The Art of War by Sun Tzu, Sun Bin, Liu Tao and Wei Liaozi, as well as ancient pre-Qin books such as Guanzi, Yanzi and Mozi, as well as Xiangguo Jing, Cao and Mozi. The simultaneous discovery of bamboo slips in Sun Tzu's Art of War and Sun Bin's Art of War has solved the unresolved questions about the existence and authenticity of the two works for thousands of years, which has made a big step forward in the study of China's ancient military thought.