DDF 6. A Devonian shale production database that contains all available data through 2005. Data compiled includes information such as core descriptions, density, gas analyses, total organic content and various geo-chemical analyses. Pertinent publications about Devonian shale from the Gas Research Institute and U.S. Department of Energy have been scanned and placed in a spreadsheet. The spreadsheet also includes an updated reference list of publications that discuss Devonian shale in Ohio.