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A Handbook for Small Surface Coal Mine Operators

Joachim Toby TourbierRichard Noble Westmacott

出版	U.S. Department of the Interior, Office of Surface Mining, 1981
URL	http://books.google.com.hk/books?id=a_v-9o5tAmsC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN