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Geologic Map Showing the Thickness and Structure of the Anderson-Wyodak Coal Bed in the North Half of the Powder River Basin, Southeastern Montana and Northeastern Wyoming (1:200,000).

Geological Survey (U.S.)

出版	1990
URL	http://books.google.com.hk/books?id=KrTWYQEACAAJ&hl=&source=gbs_api