1. Well yields and chemical quality of water from water-table aquifers in the Boulder-Fort Collins-Greeley area, Front Range Urban Corridor, Colorado [cartographic material] Yale Public content 1979. 2013-05-28T19:01:54Z. 2013-06-14T17:58:09Z. Hillier, Donald E. U.S. Geological Survey. English. Public. Colorado, Boulder County, Larimer County, and Weld County.