1. Map of the Ashtabula River and Conneaut Creek Basins and adjacent Lake Erie tributaries showing availability of underground water Maps The Ohio State University Public content 1960. Pree, Henry L. (Henry Louis), 1917-. Prepared by HENRY L. PREE, JR. Geologist, Ohio Division of Water Map side also contains legend and explanation of map symbols. Text includes inform... Ohio. Division of Water.