APA (7th ed.) Citation

(1932). Safety record of metal mines in Minnesota in 1931. [publisher not identified].

Chicago Style (17th ed.) Citation

Safety Record of Metal Mines in Minnesota in 1931. Washington, D.C.: [publisher not identified], 1932.

MLA (9th ed.) Citation

Safety Record of Metal Mines in Minnesota in 1931. [publisher not identified], 1932.