1. Approximate altitude of water levels in wells in the Chicot and Evangeline aquifers in the Houston area, Texas, Spring 1981 [cartographic material] Yale Public content 1981. 2002-06-01T04:00:00Z. 2023-02-14T04:01:23Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Texas, Houston County, and Houston County (Tex.).