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1.

図書
図書
1. Proceedings of the twenty-first annual institute on coal mining health safety and research, Blackburg, Virginia, August 28-30, 1990
edited by Edward Hugler, Alex Bacho, Michael Karmis ; sonsoring organizations: Department of Mining & Minerals Engineering, Virginia Polytechnic Institute & State University, Mine Safety and Health Administration, U.S. Department of Labor, Bureau of Mines, U.S. Department of the Interior
出版情報: Virginia : Virginia Polytechnic Institute and State University, 1990  ix, 181 p. ; 29 cm
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2.

図書
図書
2. Proceedings of the twenty-second annual institute on coal mining health, safety and research, Blacksburg, Virginia, August 26-28, 1991
edited by Edward Hugler, Alex Bacho, Michael Karmis ; sonsoring organizations: Department of Mining & Minerals Engineering, Virginia Polytechnic Institute & State University, Mine Safety and Health Administration, U.S. Department of Labor, Bureau of Mines, U.S. Department of the Interior
出版情報: Virginia : Virginia Polytechnic Institute and State University, 1991  vii, 131 p. ; 29 cm
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