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Geology and Mineral Resources of the Southern Half of the Clearfield 15-minute Quadrangle, Pennsylvania
Albert D. Glover
Pennsylvania. Bureau of Topographic and Geologic Survey
出版
Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey
, 1970
URL
http://books.google.com.hk/books?id=JZjRpwAACAAJ&hl=&source=gbs_api