The significance of the Bureau of Mines approval of gas masks

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110 1 ‡aUnited States. ‡bBureau of Mines.
245 1 4 ‡aThe significance of the Bureau of Mines approval of gas masks / ‡cThe Bureau of MInes.
246 3 0 ‡aGas masks
246 3 0 ‡aBureau of Mines approval of gas masks
260 ‡aWashington, D.C. : ‡bU.S. Dept. of Commerce, Bureau of Mines, ‡c1932.
300 ‡a1 p. ; ‡c27 cm.
490 0 ‡aInformation circular / Bureau of Mines ; ‡v6665
538 ‡aMode of access: Internet.
650 0 ‡aMine safety ‡xEquipment and supplies.
650 0 ‡aGas masks.
710 1 ‡aUnited States. ‡bBureau of Mines.
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