APA (7th ed.) Citation

Butts, C. (1922). Chart of sections of the Mississippian formations of eastern Kentucky showing relations and variations. [Kentucky Geological Survey].

Chicago Style (17th ed.) Citation

Butts, Charles. Chart of Sections of the Mississippian Formations of Eastern Kentucky Showing Relations and Variations. [Frankfort, Kentucky]: [Kentucky Geological Survey], 1922.

MLA (9th ed.) Citation

Butts, Charles. Chart of Sections of the Mississippian Formations of Eastern Kentucky Showing Relations and Variations. [Kentucky Geological Survey], 1922.