APA (7th ed.) Citation

Crawford, F. S. (1931). Safety inspections in and around iron mines in Lake Superior district. [publisher not identified].

Chicago Style (17th ed.) Citation

Crawford, F. Stuart. Safety Inspections in and Around Iron Mines in Lake Superior District. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Crawford, F. Stuart. Safety Inspections in and Around Iron Mines in Lake Superior District. [publisher not identified], 1931.