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A Pennsylvanian Florule from the Forkston Coal in the Dutch Mountain Outlier, Northeastern Pennsylvania
C. B. Read
Charles Whitney Gilmore
Joseph Augustine Cushman
Lloyd William Stephenson
Milton Nunn Bramlette
Timothy William Stanton
Frances Lawrence Parker
出版
U.S. Government Printing Office
, 1946
URL
http://books.google.com.hk/books?id=zXC3vAEACAAJ&hl=&source=gbs_api