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1
2
Washington : U. S. Govt. print. off., 1941
Revised.
Revised.
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Government Document
Libro
3
4
por Warfield, Robert S.
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1962
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1962
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Government Document
Libro
5
6
por Stevenson, John J. (John James), 1841-1924
Harrisburg [Pa.] : Pub. by the Board of Commissioners for the Second Geological Survey, 1877
Harrisburg [Pa.] : Pub. by the Board of Commissioners for the Second Geological Survey, 1877
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Government Document
Libro
7
por Stevenson, John J. (John James), 1841-1924
Harrisburg [Pa.] : Pub. by the Board of Commissioners for the Second Geological Survey, 1876
Harrisburg [Pa.] : Pub. by the Board of Commissioners for the Second Geological Survey, 1876
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Government Document
Libro
8
9
Washington, DC : American Chemical Society, 1974
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Libro
10
11
por Sisler, James D. (James Donaldson), 1894-
[Harrisburg] Dept. of Forests and Waters, Topographic and Geologic Survey 1924
[Harrisburg] Dept. of Forests and Waters, Topographic and Geologic Survey 1924
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Libro
12
por Hoffman, John Nathan, 1923-
1961
1961
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Thesis
Libro
13
por Gasper, Donald
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Thesis
Libro
14
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Thesis
Libro
15
por Reitell, Charles Ervin, 1887-
[n.p.] Pennsylvania Industrial Survey, 1927
[n.p.] Pennsylvania Industrial Survey, 1927
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Libro
16
por Katell, Sidney
Washington : U.S. Dept. of the Interior, Bureau of Mines : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976
Washington : U.S. Dept. of the Interior, Bureau of Mines : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976
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Libro
17
por Johnson, James P., 1937-
1968
1968
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Thesis
Libro
18
por Trapnell, William Colston, 1906-
[Washington, D.C.] : Federal Emergency Relief Administration, 1935
[Washington, D.C.] : Federal Emergency Relief Administration, 1935
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Libro
19