Index to geologic maps for Kentucky
MLA
Index to Geologic Maps for Kentucky. Lexington, Ky.: The Survey, [9850?]
APA, 7th edition
([9850?]). Index to geologic maps for Kentucky. Lexington, Ky.: The Survey
Chicago, 17th edition
Index to geologic maps for Kentucky. Lexington, Ky.: The Survey, [9850?]