(W 94⁰52ʹ30ʺ--W 94⁰00ʹ00ʺ/N 31⁰37ʹ30ʺ--N 30⁰52ʹ30ʺ).
Relief shown by contours and spot heights.
Modifications to USGS provisional base and base maps by the Geometronics Service Center from 1983 aerial photography and 1984 correction guides furnished by the Southwest region, Southern Region.