United States. Bureau of Mines. (1939). Dust produced by drilling when water is sprayed on outside of drill steel. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Dust Produced by Drilling When Water Is Sprayed on Outside of Drill Steel. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Dust Produced by Drilling When Water Is Sprayed on Outside of Drill Steel. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.