APA (7th ed.) Citation

United States. Bureau of Mines. (1938). Mine Safety Board decision 29: Doors for controlling ventilation in coal mines. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Mine Safety Board Decision 29: Doors for Controlling Ventilation in Coal Mines. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. Bureau of Mines. Mine Safety Board Decision 29: Doors for Controlling Ventilation in Coal Mines. [s.n.], 1938.