Ohio shale concretions
By: [compiled by Michael C. Hansen]
Contributors: Ohio. Division of Geological Survey
Series: GeoFacts -- no. 4
Publisher: Ohio Dept. of Natural Resources, Division of Geological Survey
Published: 1994
Place of publication: [Columbus]
Language: eng
Subjects: Concretions -- Ohio; Shale -- Ohio
Notes: Title from caption

Compilers name from p. [2]

"October 1994"--P. [2]

Includes bibliographical references (p. [2])