Butts, C. (1922). The Mississippian series of eastern Kentucky.: A regional interpretation of the stratigraphic relations of the sub-carboniferous group based on new and detailed field examinations. The Kentucky Geological survey.
Chicago Style (17th ed.) CitationButts, Charles. The Mississippian Series of Eastern Kentucky.: A Regional Interpretation of the Stratigraphic Relations of the Sub-carboniferous Group Based on New and Detailed Field Examinations. Frankfort, Ky.: The Kentucky Geological survey, 1922.
MLA (8th ed.) CitationButts, Charles. The Mississippian Series of Eastern Kentucky.: A Regional Interpretation of the Stratigraphic Relations of the Sub-carboniferous Group Based on New and Detailed Field Examinations. The Kentucky Geological survey, 1922.
Warning: These citations may not always be 100% accurate.