Digital Geologic-GIS Map of the Iris NW Quadrangle, Colorado (NPS, GRD, GRI, CURE, IRNW digital map) adapted from a U.S. Geological Survey Geologic Quadrangle Map by Hedlund and Olson (1974)

The Digital Geologic-GIS Map of the Iris NW Quadrangle, Colorado is composed of GIS data layers and GIS tables, and is available in the following GRI-supported GIS...科罗拉多州Iris西北四边形图幅数字地质地理信息系统（Geographic Information System）图由GIS数据图层与GIS属性表组成，可通过以下由GRI支持的GIS……获取。