1. General hydrogeology of the aquifers of Mesozoic age, Upper Colorado River Basin--excluding the San Juan Basin--Colorado, Utah, Wyoming, and Arizona [cartographic material] Yale Public content 1984. 2002-06-01T04:00:00Z. 2023-09-20T03:01:47Z. Geological Survey (U.S.). The Survey : [Books and Open-File Reports Section, distribution]. English. cartographic image. Public. Colorado River Watershed (Colo.-Mexico).