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Google圖書搜尋
A Pennsylvanian Florule from the Forkston Coal in the Dutch Mountain Outlier, Northeastern Pennsylvania
Charles Brian Read
Charles Whitney Gilmore
Joseph Augustine Cushman
Lloyd William Stephenson
Frances Lawrence Parker
出版
U.S. Government Printing Office
, 1946
URL
http://books.google.com.hk/books?id=qLEZzwEACAAJ&hl=&source=gbs_api