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by Engel, A. L. (Abraham L.)
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1953
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1953
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by Engel, A. L. (Abraham L.), Heinen, H. J. (Harold J.)
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1960
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1960
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by Engel, A. L. (Abraham L.)
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1951
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1951
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by Wells, R. R.
[Washington] : U.S. Bureau of Mines, 1950
[Washington] : U.S. Bureau of Mines, 1950
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by Kral, Victor E.
[Washington, D.C.] : Dept. of the Interior, Bureau of Mines, 1947
[Washington, D.C.] : Dept. of the Interior, Bureau of Mines, 1947
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17
by Holmes, George H.
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1946
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1946
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