Geodatabase of the datasets that represent the three subareas of the Silurian-Devonian aquifer, Illinois, Indiana, Iowa, Kentucky, Michigan, Missouri, Ohio, Tennessee, and Wisconsin

This geodatabase includes spatial datasets that represent the Silurian-Devonian aquifers in the States of Illinois, Indiana, Iowa, Kentucky, Michigan, Missouri, Ohio,...本地理数据库（Geodatabase）包含可表征美国伊利诺伊州、印第安纳州、艾奥瓦州、肯塔基州、密歇根州、密苏里州、俄亥俄州等区域志留纪-泥盆纪含水层的空间数据集。