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Ancient Volcanic Rocks of South Mountain, Pennsylvania, by Florence Bascom. [U.S. Geological Survey Bulletin No. 136.].

Florence BascomUnited States. Congress. House

出版	U.S. Government Printing Office, 1896
URL	http://books.google.com.hk/books?id=jz5oQwAACAAJ&hl=&source=gbs_api