by Robert A. Darner, John S. Tertuliani, and Ralph J. Haefner ; in cooperation with the Ohio Department of Natural Resources, Division of Mineral Resource[s] Management
Mode of access: Internet at the USGS web site. Address as of 8/25/08: http://pubs.usgs.gov/sir/2005/5196/pdf/SIR%202005-5196%5FWeb.pdf ; current access is available via PURL.