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Early Tertiary Mollusks from the Powder River Basin, Wyoming-Montana, and Adjacent Regions

Dwight Willard Taylor

出版	U.S. Department of the Interior, Geological Survey, 1975
URL	http://books.google.com.hk/books?id=mGgeAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN