Cite

Geological map of Ohio : showing the positions of the oil and gas wells / J.N. Bradford, Del.

MLA

Geological Map of Ohio : Showing the Positions of the Oil and Gas Wells / J.N. Bradford, Del. s.n.,], 1886. https://collections.library.yale.edu/catalog/15814372.

APA, 6th edition

Geological map of Ohio : showing the positions of the oil and gas wells / J.N. Bradford, Del. (1886). [Geological maps]. s.n.,]. https://collections.library.yale.edu/catalog/15814372.