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30by Lorain, S. H., Wells, R. R., Mihelich, Miro, Mulligan, J. J., Thorne, R. L., Herdlick, J. A.Get access
Published 1958
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33by Petersen, Max S.“... Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines. Donor: United States...”
Published 1944
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34by Petersen, Max S.“... Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines. Donor: United States...”
Published 1944
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35by Petersen, Max S.“... Mining History Archive, Arthur Lakes Library, Colorado School of Mines. Donor: United States Bureau...”
Published 1944
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36by Petersen, Max S.“... Mining History Archive, Arthur Lakes Library, Colorado School of Mines. Donor: United States Bureau...”
Published 1944
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37by Petersen, Max S.“... of Mines. Donor: United States Bureau of Mines. A man operates a mine rescue telephone at the fresh-air...”
Published 1944
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38by Petersen, Max S.“... of Mines. Donor: United States Bureau of Mines. A man operates a mine rescue telephone at the fresh-air...”
Published 1944
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39by Petersen, Max S.“..., Arthur Lakes Library, Colorado School of Mines. Donor: United States Bureau of Mines. A churn drill...”
Published 1944
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40by Petersen, Max S.“...: United States Bureau of Mines. A churn-drill tool used to sink a ventilation hole lies in the snow...”
Published 1944
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