United States. Bureau of Mines. (1931). List of permissible self-contained oxygen breathing apparatus, gas masks, and hose masks. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. List of Permissible Self-contained Oxygen Breathing Apparatus, Gas Masks, and Hose Masks. [Washington]: [publisher not identified], 1931.
MLA (9th ed.) CitationUnited States. Bureau of Mines. List of Permissible Self-contained Oxygen Breathing Apparatus, Gas Masks, and Hose Masks. [publisher not identified], 1931.
Warning: These citations may not always be 100% accurate.