936 resultados para Underground Mine


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1909-18, 1927-34, 1936, 1938 issued in 2 vols. each year; 1919-24, issued in 3 vols. each year.

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"Coal Industry Advisory Committee to the Ohio River Valley Water Sanitation Commission. Research project no. 370-8."

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"Commonwealth of Pennsylvania Department of Health. Industrial fellowship no. 326B-6."

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