1. Approximate altitude of water levels in wells in the Chicot and Evangeline aquifers in the Houston area, Texas, spring 1986 [cartographic material] Yale Public content 1986. 2023-10-25T19:05:53Z. 2023-10-26T03:02:30Z. Williams, James Frank, 1944-. U.S. Geological Survey ; [Books and Open-File Reports Section, distributor]. English. cartographic image. Public. Texas, Houston Region, and Houston Region.