Author: Harold B. Ewoldt
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Category : Manganese ores
Languages : en
Pages : 46
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Author: W. H. Kerns
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Category : Bedford County (Pa.)
Languages : en
Pages : 234
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Author:
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Category : Mineral industries
Languages : en
Pages : 750
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Author: United States. Bureau of Mines
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Category : Mineral industries
Languages : en
Pages : 840
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Author: United States. Bureau of Mines
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Category : Mineral industries
Languages : en
Pages : 222
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Author:
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Category : Mineral industries
Languages : en
Pages : 932
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Author: United States. Bureau of Mines
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Category : Government publications
Languages : en
Pages : 846
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Author: United States. Bureau of Mines
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Category : Mineral engineering
Languages : en
Pages : 838
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Author: Ralph Jackson Roberts
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Category : Geology
Languages : en
Pages : 520
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Category : Geology
Languages : en
Pages : 442
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