Digital Surficial Geologic-GIS Map of the Iowa City East Quadrangle, Iowa (NPS, GRD, GRI, HEHO, ICEA_surficial digital map) adapted from a Iowa Geological Survey Open-File Map by Krieg, Tassier-Surine, Quade, Bettis, Artz and Giglierano (2004)

The Digital Surficial Geologic-GIS Map of the Iowa City East Quadrangle, Iowa is composed of GIS data layers and GIS tables, and is available in the following GRI-...爱荷华州艾奥瓦城东象限图幅数字地表地质地理信息系统（Geographic Information System，简称GIS）图由GIS数据图层与GIS表格构成，可通过以下GRI-...获取。