United States. Bureau of Mines. (1938). Methods for protection against silicosis and when they are justified [respiratory disease among miners]. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Methods for Protection Against Silicosis and When They Are Justified [respiratory Disease Among Miners]. [Washington]: [s.n.], 1938.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Methods for Protection Against Silicosis and When They Are Justified [respiratory Disease Among Miners]. [s.n.], 1938.
Warning: These citations may not always be 100% accurate.