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Download or read book Clay and Shale Resources in Pennsylvania written by Henry Leighton and published by . This book was released on 1941 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Catalog of Books and Reports in the Bureau of Mines Technical Library Pittsburgh Pa written by United States. Bureau of Mines. Technical Library, Pittsburgh and published by . This book was released on 1968 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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