登入選單
返回Google圖書搜尋
Stratigraphy of the Bitmuninous Coal Field of Pennsylvania, Ohio and West Virginia
出版U.S. Government Printing Office, 1891
URLhttp://books.google.com.hk/books?id=HBJDAAAAIAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN