List of permissible self-contained oxygen breathing apparatus, gas masks, and hose masks /
prepared by the Safety Section of the Bureau of Mines.

APA Citation

United States. Bureau of Mines. (1931). List of permissible self-contained oxygen breathing apparatus, gas masks, and hose masks. [Washington, D.C.]: U.S. Dept. of Commerce, Bureau of Mines.

MLA Citation

United States. Bureau of Mines. List of Permissible Self-contained Oxygen Breathing Apparatus, Gas Masks, And Hose Masks. [Washington, D.C.]: U.S. Dept. of Commerce, Bureau of Mines, 1931.

Warning: These citations may not always be complete (especially for serials).