Menghan Qiu, Ruiliang Liu, Xingyuan Li , Linyao Du, Jiaming Luo, Shengqian Chen, Xiaoyan Yang, Yongqiang Wang *, Jianye Han *, Fahu Chen, Guanghui Dong, 2023. Earliest systematic coal exploitation for fuel extended to ~3600 B.P.. SCIENCE ADVANCES.
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