APA (7th ed.) Citation

United States. Bureau of Mines. (1940). Mineral trade notes, June 20, 1940. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Mineral Trade Notes, June 20, 1940. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. Bureau of Mines. Mineral Trade Notes, June 20, 1940. [s.n.], 1940.

Warning: These citations may not always be 100% accurate.