Geodatabase of the available top and bottom surface datasets that represent the Mississippian aquifer, Alabama, Illinois, Indiana, Iowa, Kentucky, Maryland, Missouri, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia

This geodatabase includes spatial datasets that represent the Mississippian aquifer in the States of Alabama, Illinois, Indiana, Iowa, Kentucky, Maryland, Missouri,...本地理数据库（geodatabase）包含用于表征美国阿拉巴马州、伊利诺伊州、印第安纳州、艾奥瓦州、肯塔基州、马里兰州、密苏里州等州境内密西西比含水层（Mississippian Aquifer）的空间数据集（spatial datasets）。