APA (7th ed.) Citation

Koronski, G. W., & Mayer, L. L. (1940). Map of Gogebic County, Michigan. Leonard L. Mayer, County Engineer.

Chicago Style (17th ed.) Citation

Koronski, George W., and Leonard L. Mayer. Map of Gogebic County, Michigan. [Place of publication not identified]: Leonard L. Mayer, County Engineer, 1940.

MLA (9th ed.) Citation

Koronski, George W., and Leonard L. Mayer. Map of Gogebic County, Michigan. Leonard L. Mayer, County Engineer, 1940.