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Microscopic Study of Elkhorn Coal Bed at Jenkins, Letcher County, Ky
Reinhardt Thiessen
George C. Sprunk
Hugh J. O'Donnell
出版
U.S. Government Printing Office
, 1931
URL
http://books.google.com.hk/books?id=UR9kbagl-uoC&hl=&source=gbs_api
EBook
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