1. Hydrogeologic characteristics of the valley-fill aquifer in the Arkansas River Valley, Crowley and Otero counties, Colorado [microform] Yale Public content 1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : Books and Open-File Reports Section [distributor]. English. Public. Colorado, Crowley County, and Otero County.