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发表于2024-11-29
Coal pdf epub mobi txt 电子书 下载 2024
Formed over millions of years, coal is a sedimentary rock that has been mined by people for use as fuel at least as far back as 1000 BC. This fascinating new book shows the basic make-up of coal, how it is mined, and the problems its use has created.
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Coal pdf epub mobi txt 电子书 下载 2024