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- catalog contributor b8924819.
- catalog created "1938.)".
- catalog date "1938".
- catalog date "1938.)".
- catalog dateCopyrighted "1938.)".
- catalog extent "14 pp.".
- catalog isPartOf "U. S. Department of Interior. Bureau of Mines. Information Circular 7036".
- catalog issued "1938".
- catalog issued "1938.)".
- catalog language "eng".
- catalog publisher "(Washington. The Department.".
- catalog title "Necessity for more extended use of safety equipment in mining.".
- catalog type "text".