by C. G. Menke, E.W. Meridith, and W.S. Wetterhall. "Prepared by the Unites States Geological Survey in cooperation with the Florida Geological Survey. Hillsborough County, and the City of Tampa, Florida." This report contains the data on which the authors' report "Water resources of Hillsborough County, Florida," published by the Florida Geological survey as Report of investigations no. 25, was based.