On a handshake : humble beginnings to global impact: Ohio's oil & gas industry /

by Camp, Mark J., 1947-
San Antonio, Texas : HPNbooks, 2016
First edition.

Roadside geology of Indiana /

by Camp, Mark J., 1947-
Missoula, Mt. : Mountain Press, 1999

Roadside geology of Ohio /

by Camp, Mark J., 1947-
Missoula, MT : Mountain Press Pub., 2006

Ohio oil and gas /

by Spencer, Jeff A.
Charleston, SC : Arcadia Pub., 2008