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- catalog contributor b8924793.
- catalog created "1937.]".
- catalog date "1937".
- catalog date "1937.]".
- catalog dateCopyrighted "1937.]".
- catalog extent "6 pp.".
- catalog isPartOf "United States. Department of Interior. Bureau of Mines. Information Circular 6952".
- catalog issued "1937".
- catalog issued "1937.]".
- catalog language "eng".
- catalog publisher "[Washington. The Department.".
- catalog title "List of respiratory protective devices approved by the U.S. Bureau of Mines.".
- catalog type "text".